A comfortable and properly fitted grip is essential to a good release. One 1insert included in price. Image shows difference in the 2 sides of insert.Style Combo Semi Finger Tip and Power NubSemi Finger Tip, or Bump Grip as it is frequently referred.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.Power NubThe finger pad of the Power Nub is lined with rows of small, raised bumps. The Power Nub has a very sharp feel and is not for the faint of grip! This style is recommend for a strong grip.Quad finger inserts have the standard 3132 outer diameter in sizes 1932 1316 and a 1 132 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. Product Type Bowling Accessories