after try out a variety of dumbbell over the year , this be now the one I recommend and the one I be certain I 'll always stick with . I feel as though this design be make by someone who actually work out or do market research as to the complaint of other dumbbell prior to manufacturing . here be some difference you 'll note in these : \*\* Neoprene coating where other have shiny vinyl or metal that cause the dumbbell to slip from you hand during a sweaty workout or at the very least make it difficult to grip , these be coated in neoprene which be not slick but still do not collect dirt and it easy to clean . even better , it protect wooden floor when you set they down in the midst of work out ... or whatever else you might set it on . metal dumbbell leave scratch . hexagonal design : where other dumbbell be typically round for no good reason , the fact that no matter how you put these down or how you hold they , they will not and can not roll away from you or roll off a table etc. be for sure a plus . easy-to-read weight : whereas many dumbbell have the weight raise on the metal surface , these be simple to see at a glance when you choose you dumbbell if you have multiple set . better yet , all the weight amount be color code in different color of dumbbell so even if you can not see the number , you pick up the right weight in a flash during some fast cardio move . Stylin ' : sometimes bright cheerful weight equipment be just a bit more motivate and fun for work out . I be lookin ' at you , royal purple set ! plus a few set kinda brigthen up that workout room . I have no complaint ... my fave .