Like a lot of you, when I first saw thumb tapes I thought it would be a fad … I could not have been more wrong!! These are simply the thumb knuckle saving device on the market for bowler. Whether you need to keep the skin on the back of your thumb or like to build it up to get the snug feel you want in a thumb hole – thumb tape a great solution. For the Genesis series is goes like this: #1 Red is the thin one for the fastest release; #2 Blue is thicker for a med-fast release, #3 Purple is thicker yet for a medium release, and # 4 Orange is the thickest for a slower release. I use these tapes and highly recommended them.