Unlike the smooth, quick release of Urethane thumb products, Xcel thumb products offer a more textured feel for slower release. They are made from softer, more pliable blend of material that makes them easy to drill, cut, bevel and sand without the use of a router or plug cutter. This product is often recommended for bowlers with very dry skin.Outside Diameters Sizes 5164 6164 use 1 18 Hole Sizes 3132 1 116 use 1 14 HoleProduct Type Bowling Accessories