Just a word of advice to those who may be interested in these things . First try out of the package it was a disaster as they are not designed to be used with a wrist support that has the forefinger fixed aka Robby's RevIII. Found that due to the amazing grip level of the Turbo Grip , it was difficult to get the fingers into the ball and rest the forefinger on the outside of the ball in a comfortable and consistent manner . After much thought it was decided to modify the grip by reshaping the squared off edges and removing the small raised nipples to achieve two goals , allow comfortable fit with wristers forefinger support and decrease grip on ball . This would be a great item for those who can use the added grip but i just wanted something to protect my forefinger from the punishment of bowling large blocks of games at a time and last a reasonable amount of time . Just a finger thimble made of a hard wearing flexible material would be great but was unable to locate at this time so i continue to look . Thanks for all the help evryone .