Silver Zipper shot glasses keeps track of the number of shots

A lot of people drink without really keeping track of how much they have really gulped down. The purpose of these shot glasses with painted zipper teeth and an actual zipper attached is to figure out how much of the glass is actually empty or full. The glass also helps one determine how many buttons the drinker of all these shots chooses to undo. As the number of shots increase the zip unbuttons gradually. The cost of these mind blowing shot glasses is $40 only.