in fig1 and fig2 a sticker showing a fundamental concept of the present invention is shown . the sticker comprises a flexible sticking sheet 1 , a layer 2 of adhesives thereon , and , stuck on the surface of the adhesives , a releasable sheet 3 . on the releasable sheet 3 , there is provided , substantially below the sticking sheet 1 , a parting line 4 forming and defining a relatively narrow , strip - like portion 6 of the releasable sheet , which portion has an end 5 ( fig1 ), or two ends 5 ( fig3 ). each of these ends provides a lug 5 which extends to the outside of sheet 1 . when the sticker is used for a seal or the like , the sticking sheet 1 thereof is stripped off from the releasable sheet 3 , then its adhesive layer 2 is exposed , while said lug 5 is separated at the parting line 4 together with said strip - like portion 6 and said sticking sheet from the side of the releasable sheet , ( also see fig4 ), so that said sticking sheet may then be stuck on the opening of an envelope or the like 8 to effect sealing ( fig1 ). in this case , since the strip 6 can be kept adherent to sticking sheet 1 and an end portion or lug 5 of the strip 6 is in a free state extending outside of the stuck sheet , the lug , strip and sheet may be pulled up by picking it up with the fingers to strip off the sticking sheet for opening the envelope . the strip portion 6 of the lug 5 , extending under the sticking sheet 1 will facilitate the breaking or stripping of the envelope when it is opened . the portion 6 of said lug 5 extending under the sticking sheet may produce similar effect when it is formed shorter than shown ; on the other hand as shown in fig3 both ends of lug 5 may extend outside from the edge portions of the sticking sheet 1 . said sticker may be formed in such manners that plural sticking sheets are arranged on a release sheet with or without intervals , adjoining each other in parallel , in series or in series - parallel . in fig4 a plurality of said sticking sheets 1 are arranged on a release sheet with intervals in lengthwise and crosswise directions , showing stickers with parting lines 4 for forming lugs 5 similar to the above on said release sheet 3 . in fig5 and fig6 there are shown a plurality of sticking sheets 1a arranged on a release sheet adjoining each other with parting lines 7 therebetween . parting lines 4a for each strip 6a having lug 5a provided in a release sheet 3a of the sticker , are extended over an under portion of each sticking sheet 1a and an under portion of another sticking sheet 1a adjoining the former . as already noted , when a sticking sheet 1a is stripped off from the release sheet 3a , the strip - like part 6a with lug 5a remains on the adhesive surface 2a ; thereby facilitating the stripping off operation itself and also facilitating any desired , ultimate lifting off of the sticker 1a from a surface to which it has been applied . such stickers 1a of continuous shape may be used for many sealing operations , by stripping off the sticking sheets successively from their release sheet 3a . said sticker may be disposed for an efficient sealing operation by winding it to form a roll or cylinder ( fig7 ) and loading it on a sealing machine ( not shown ). still another example or variant is shown in fig8 and fig9 . this example is different in the point that a plurality of sticking sheets 1b are lengthwise and crosswise arranged in parallel bordered by parting lines 7a and 7b and in some points that will be explained hereafter . otherwise it is about the same as the example shown in fig5 and fig6 . and , in this example , each partition line 7b extending in axial direction may pass through the transverse parting lines 7a between the sheets 1b . the arrangement of lug ends 5b of strip portions 6b in the releasable sheet 3b corresponds to the arrangement of ends 5a in releasable sheet 3a of fig5 . holes 8b provided on side edge portion 9b of the base material on the outside of said sticking sheet may be utilized for feeding of the base material , in color printing , automatic control of working process by means of computer , etc . the portion 9b around the sticking sheet will be removed after required working process is finished , however , it may be left behind if necessary . simple variants as will be mentioned hereafter may be made according to the present invention . they include ; release sheet 3c of a circular sticking sheet 1c having a parting line 4c for forming an elliptical lug 5c ( fig1 ), release sheets 3d of sticking sheet 1d having parting lines 4d for forming triangle lugs 5d ( fig1 ), release sheets 3e of sticking sheet 1e having parting lines 4e for forming irregular shaped lug 5e ( fig1 ), release sheet 3f having parting lines 4f for forming lugs 5f on corner portions of sticking sheets 1f ( fig1 ), and release sheet 3g of sticking sheet 1g having parting line 4g for forming lug 5g of relatively large shape ( fig1 ). each of above mentioned stickers according to the present invention may be temporarily stuck on the surface of any body , for which its lug will serve , and be stripped off later . for instance , the sticker may be used for indication 10 of the contents by sticking it temporarily on a bottle as shown in fig1 . and , the sticker may be used as a substitute for paste , with which notice papers such as posters and the like are stuck on walls , notice boards , telegraph poles , etc ., or may be used as a substitute for a thumbtack when works of pupils and students , such as drawings , materials for lecture , etc ., are put up on a black board or wall in a school or lecture hall . the sticker according to the present invention may be manufactured as follows . the material for sticking sheets made of paper to be used for sealing paper is coated with adhesive liquid having a composition as exemplified below to form pressure sensitive adhesive layer , on which the material for a release sheet having releasability against said pressure sensitive adhesive is put in layers to prepare the base material . ______________________________________examples for compounding ratio of pressuresensitive adhesive :( a ) polyisobutylene 100 weight part ( molecular weight 52 , 000 ) hydrogenated coumarone - indene 40 &# 34 ; &# 34 ; methyl acetate 20 &# 34 ; &# 34 ; zinc white 50 &# 34 ; &# 34 ; heptane 700 &# 34 ; &# 34 ;( b ) acrylic acid 2 - ethyl 80 &# 34 ; &# 34 ; hexyl polymerpoly vinyl acetate 15 &# 34 ; &# 34 ; acrylic acid polymer 5 &# 34 ; &# 34 ; ethyl acetate 75 &# 34 ; &# 34 ; toluene 75 &# 34 ; &# 34 ;( c ) styrene - isoprene block 60 &# 34 ; &# 34 ; copolymerhydrogenated rosin ester 40 &# 34 ; &# 34 ; antioxidant 0 . 1 &# 34 ; &# 34 ; n - hexane 400 &# 34 ; &# 34 ;( d ) pale crepe rubber 100 &# 34 ; &# 34 ; poly β pinene resin 75 &# 34 ; &# 34 ; petroleum oil 5 &# 34 ; &# 34 ; polymerized trimethyl 2 &# 34 ; &# 34 ; di - hydroquinonemixed hydrocarbon solvent 350 &# 34 ; &# 34 ;( e ) styrene - butadiene rubber 50 &# 34 ; &# 34 ; smoked rubber 50 &# 34 ; &# 34 ; hydrogenated rosin ester 50 &# 34 ; &# 34 ; trimethyl hydroquinone 2 &# 34 ; &# 34 ; petroleum oil 20 &# 34 ; &# 34 ; mixed hydrocarbon solvent 350 &# 34 ; &# 34 ; ______________________________________ in place of the sticking sheet materials such as the above mentioned papers , synthetic resin sheet , synthetic paper , metal foil , papers and resin sheet having metal foil or metallizing layer , etc ., may be used . while the present invention has been described in its several examples , it is understood that the invention is not limited therein , but changes and variations may be made within the spirit of the invention set forth in the following claims .