in a combination coating film transfer tool and ball - point pen , the transfer tool comprises a case , and a replacement cassette comprising supply and take - up reels and a transfer head . the cassette fits tightly , but removably , in the case , with the tip of the transfer head projecting from the case . the cassette is replaced from time to time , but the case can be reused . consequently waste of plastic is reduced , and the replacement units can be manufactured less expensively .