Check the listing for details. Turbo Quad Classic Pro Bowling Ball Finger Insert. Color: Black or Blue, Condition: New. Listed at 6.61 USD. Turbo Quad Classic Pro Finger Insert Upgrade your bowling game with the Turbo Quad Classic Pro – a perfect blend of innovation and performance. Key Features: Patented Glue Channel: Ensures clean installation and prevents glue seepage onto the ball surface. Perfect Oval (Side 1): Milled oval shape for a natural and relaxed fit, mimicking the shape of your fingertip. Power Lift 1/4" (Side 2): Enhances loft and length of release, featuring a flat edge and smooth surface for a clean feel. Stiffer Flex: Same great shape and fit as the Quad Classic with increased stiffness and firmer texture. Size Indicators: Convenient indicators both inside and outside for easy sizing. Specifications: Standard Diameter: 31/32" (Grip sizes 19/32" - 13/16" or #0 - 8). Large Diameter: 1 1/32" (Grip sizes 53/64" - 29/32" or #8.5 - 11). Color Options: Available in 2 attractive colors. Durometer Hardness: 50 Shore A for optimal performance. Experience the Turbo Quad Classic Pro advantage with 19 different sizes tailored to your needs. Each insert is sold individually, giving you the flexibility to customize your grip. Elevate your game with Turbo Quad Classic Pro Finger Insert – the choice of champions.