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These handcrafted 2-inch cylinder rock-climbing holds are a great tool for training extreme grip strength. Work vertical-grip pull-ups, one in each hand, or the 8-inch length allows for a two handed grip on one Piston. Gripping these bad boys takes brute hand strength and forearm strength and will make you a Beast in short order. If you're not ready for extreme training just yet, work your way up slowly and safely like the pros. Begin by strapping these to a dumbell or kettlebell to train this extreme grip strength with less weight, and increase your strength until you are able to do pullups and eventually dynamic exercises. Great for: Cross fit training Gymnastics strength training Grappling hand training Power Training Rock climbing grip strength Obstacle race or American Ninja Warrior training.These types of grips are often seen on American Ninja Warrior and other extreme obstacle courses. Compatible with Slackers Ninja Line. Weather-resistant textured sealant makes them great for limited use outdoors too! Materials: Grips: The grips are made of solid wood, textured with a light weather resistant texture that will provide friction while not hurting your hands. Eyelets: Made of zinc plated solid steel, rated to 250 lbs each. Straps: NOT INCLUDED Use rope or nylon webbing and affix to pullup bar, monkey bars, playground equipment, tree branch, etc. 100% MADE IN THE USA. More specifically, the great state of Maine. Warrior Life Gear is the official brand of the Maine Warrior Gym.