Quad - Turbo 2 in 1 Bowling Ball Grips THIS ITEM IS FOR ONE (1) #21 GRIP 🍒 Made USA * A comfortable and properly fitted grip is essential to a good release. * One insert is included in the price. The images show the "Semi Finger Tip" or "Bump" Grip (as it is frequently referred to.) *The Semi finger tip insert has a smooth, rounded bump close to the front edge of the insert. When properly fit, the bump rests between the first knuckle of the finger. It is designed for a more relaxed grip and ideal for bowlers who suffer from arthritis or have weak grip pressure. *Quad finger inserts have the standard 31/32" outer diameter in sizes 19/32"-13/16" and a 1-1/32" outer diameter in larger sizes. *As an added plus, each Quad insert is designed with a patented Glue Groove to minimize excessive adhesive from seeping to the surface of the ball during installation. *For Turbo Grips, if the outside of your insert says: 19 = 01-19/32 5 = 02-5/8 41 = 025-41/64 21 = 03-21/32 23 = 05-23/32