What is the difference between standard J-Cups and roller J-cups

By A Mystery Man Writer

RitFit J Hooks Power Rack 2x2 Attachments, J Cups for Squat Rack, Barbell Bar Holder of Power Cage Accessories, 2/Set with Rubber Liners Easy Rack/Unrack Bar Design : Sports & Outdoors

What is the difference between standard J-Cups and roller J-cups for a squat rack? - Quora

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BFJ Combo Roller J-Hooks – Bridge BUILT

Want a pair of j-cups that rack your bar to the perfect place every time? Then you need the Fringe Sport 3x3 Roller J-Cups on your squat rack or squat

Fringe Sport 3x3 Roller J-Cup

Ghost Strong J-Cup 2.0 One Month Revisit: ZERO ISSUES w/ the exception of expected scuffing to the front of the unprotected cup + wear/tear of the composite rollers. Steel roller upgrade is

BFJ Combo Roller J-Hooks – Bridge BUILT