Product Description
Complete your interchangeable thumb setup with the Turbo Switch Grip NX Inner Sleeve with 1 3/8" Urethane Slug — the removable half of Turbo's next-generation thumb insert system, pre-loaded with a 1 3/8" 100% urethane thumb solid ready to drill and fit. Engineered with oversized Dual-Winged Tabs and an all-new Dual Snap™ Locking System, the NX Inner Sleeve creates greater surface contact with its matching Outer Sleeve for enhanced stability, a stronger connection, and an unmistakable locked-in feel shot after shot.
Because the 1 3/8" size is larger than the 1 1/4" option, this sleeve is built with a slightly different profile — roughly half urethane thumb solid and half locking mechanism — to accommodate the bigger slug while still delivering the same secure Dual Snap connection (Turbo Grips NX installation video). The Inner Sleeve is the piece that carries the bowler's actual thumb fit and slides in and out of the permanently installed Outer Sleeve, letting bowlers use the same comfortable thumb hole across every ball in their bag, or quickly adjust fit as their thumb swells or shrinks throughout a match. No more taping and re-taping — just twist, click, and bowl with total confidence.
Note that the Switch Grip NX Inner Sleeve features larger, redesigned locking tabs than the Original Switch Grip® and is only compatible with the NX Outer Sleeve — it will not lock into the original Outer Sleeve, so bowlers upgrading to NX will need to replace both pieces in each of their balls.
Note that the Switch Grip NX Inner Sleeve features larger, redesigned locking tabs than the Original Switch Grip® and is only compatible with the NX Outer Sleeve — it will not lock into the original Outer Sleeve, so bowlers upgrading to NX will need to replace both pieces in each of their balls.
Key Features:
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Pre-installed 1 3/8" 100% urethane thumb solid — ready to drill
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Larger-diameter profile built for bigger thumb sizes
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Oversized Dual-Winged Tabs for maximum surface contact and stability
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Dual Snap™ Locking System for a stronger, more secure, locked-in fit
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Compatible exclusively with the Switch Grip NX Outer Sleeve (not interchangeable with the Original Switch Grip Outer Sleeve)
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Ideal for bowlers who play multiple balls and want a consistent thumb fit
Turbo Switch Grip NX Inner Sleeve with 1 3/8" Slug Installed FAQ
What is the Turbo Switch Grip NX Inner Sleeve with 1 3/8" slug used for?
This Inner Sleeve is the removable half of the Switch Grip NX system, pre-loaded with a 1 3/8" urethane thumb solid. It holds the bowler's actual thumb fit and locks into the permanently installed Outer Sleeve, allowing the same thumb fit to be moved between different bowling balls in seconds.
How is the 1 3/8" version different from the 1 1/4" version?
Beyond the larger slug size, the 1 3/8" Inner Sleeve has a slightly different build — roughly half urethane thumb solid and half locking mechanism — to fit the bigger diameter while still delivering the full Dual Snap Locking System connection (Turbo Grips NX installation video).
Is the 1 3/8" slug already installed, or do I need to add it myself?
The 1 3/8" 100% urethane thumb solid comes pre-installed in the sleeve, so your pro shop can drill it directly to the bowler's thumb size without fitting a separate solid.
Is this Inner Sleeve compatible with the Original Switch Grip Outer Sleeve?
No. The NX Inner Sleeve features larger, redesigned locking tabs that only fit the Switch Grip NX Outer Sleeve. Bowlers switching to NX need to replace both the Inner and Outer Sleeve in every ball, since the two generations are not cross-compatible.
Do I need the Outer Sleeve too, or does this come as a complete set?
The Inner Sleeve requires a Switch Grip NX Outer Sleeve, sold separately, permanently installed in the thumb hole. The two pieces work together to complete the interchangeable thumb assembly.
Can I install this myself?
The Outer Sleeve installation and drilling the pre-installed solid to final thumb size should be done by a qualified pro shop technician. Once installed, bowlers can easily insert and remove the Inner Sleeve themselves with a simple twist and click.
What colors is this Inner Sleeve available in?
The 1 3/8" Switch Grip NX Inner Sleeve is available in Black.
