Pre-loaded inner sleeve with a urethane thumb slug already installed. Ready to drill ? just open the package and start drilling your thumb hole. Compatible with the Ultimate interchangeable thumb insert system. Size: 1 3/8″.
Details
- System: Ultimate IT Interchangeable Thumb
- Component: Loaded Inner Sleeve
- Slug size: 1 3/8″
- Quantity: Single
How the JoPo Twist System Works: Install an outer sleeve in each bowling ball’s thumb hole. Drill your custom thumb fit into one inner sleeve. Swap that single inner sleeve between balls, same perfect fit every time.
Ships free with no minimum purchase. 60-day hassle-free returns.


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