A comfortable and properly fitted grip is essential to a good release. In addition to adding to your enjoyment of the game and preventing sport injury, a properly fit grip can add revolutions, create more ball speed and make the ball feel lighter. Adding finger and/or thumb inserts to your equipment will also give you consistent feel when using a variety of different bowling balls.Turbo 2-N-1 Grips offers the greatest selection of styles, textures, sizes and colors to ensure you get the fit and feel that's right for you.
How to tell the size of inserts on your ball
You can have a proshop measure them to see if they can confirm the size or you would have to remove the insert to see what size is listed on the side of the insert.
how do I know what size my lifts are? one has "11" on it other has "21"
For the one marked 21 it can only be a size 21/32. For the one that says 11 it could be 11/16 but Turbo also has a size chart that shows the number 11 could also be a 29/32. You may measure the diameter of the insert to see which size looks to be the closest on this one just to be sure.