Check the listing for details. JoPo Grips Twist Inner Sleeve Blank. Color: Assorted, Condition: New. Listed at 16.68 USD. JoPo Grips Twist Inner Sleeve Blank Upgrade your bowling experience with the JoPo Grips Twist Inner Sleeve Blank, designed for use with the JoPo Grips Twist system. This innovative inner sleeve allows you to customize your grip by inserting the thumb slug of your choice. Key Features: Compatible with thumb solids, pre-drilled thumbs, and custom thumb slugs Patented technology for a durable bowling grip Thread-like feature absorbs weight and ball delivery velocity Twist cannot be removed without a 360-degree rotation Accepts 1 1/4 inch slugs or inserts Available in Black, Blue, Green, Orange, Pink, Purple, Red, White & Yellow JoPo Grips takes your bowling game to the next level with this revolutionary interchangeable thumb insert. The patented technology ensures a durable grip that enhances your overall bowling performance. Picture effortlessly pulling a nut straight off a bolt without unscrewing it – that's the kind of efficiency the JoPo Grips Twist Inner Sleeve Blank brings to your game. The thread-like feature absorbs the load of the weight and the velocity of the bowling ball delivery, ensuring a smooth and controlled release. Experience the difference – the Twist cannot be removed from the bowling ball without the inner being rotated 360 degrees, providing a secure and reliable grip every time you step onto the lane. Upgrade your game today with the JoPo Grips Twist Inner Sleeve Blank, the perfect companion for avid bowlers seeking precision and control.