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This O-shaped silicone grip ring is a one-piece molded hand training tool with color-coded resistance levels and poundage printed on the surface. Made of premium high-rebound tear-resistant silicone, it is fully waterproof and washable, offering a comfortable pinch experience without hand irritation. Compact and lightweight, it serves multiple purposes including fitness grip training, office fatigue relief, daily hand exercise for seniors and kids, and auxiliary rehabilitation after hand injuries. Custom silk-screen brand logos and mixed-resistance combo sets are supported to meet OEM and retail demands.