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Roto Grip / Cores / Mentor

Mentor

Core · 1 ball · all Roto Grip cores

Discontinued

Often still available from retailers and pro shops.

Roto Grip DUO

DUO ✓ USBC ApprovedDiscontinued

CarryDown

The current bowling ball catalog — specs, legality, and where to buy. Built for league bowlers.

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Affiliate disclosure: CarryDown may earn a commission from qualifying purchases made through retailer links on this site, at no extra cost to you. Ball data is sourced from manufacturer websites and the USBC/PBA approved ball lists — see Attributions for the full list of sources.

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