Bowlerstore Products Turbo Shur Cushion 3/8 Inch- 20 Count Shur Cushions are an inexpensive, quick and convenient solution for bowlers who suffer from an inconsistent release due to a thumb that shrinks and/or swells Easily inserted into any thumb hole, the special density foam of each Cushion adjusts to the size and shape of your thumb to create the perfect fit The top layer (white side) is the slick Shur Out that ensures a smooth release