Material : PU Size : Ball diameter 7 Features : 1 GRIP STRENGTH TRAINING - Pair of two balls with matching webbing for training grip strength, rock-climbing, American Ninja Warrior training, Parkour, Crossfit, obstacle racing, Grappling and more! 2 VERSATILITY: Our climbing holds can be utilized in quite a lot of diversified genre exercises and an unlimited number of exercises Simply wrap the strap around a bar, dumbbell or barbell and execute your favorite workouts three & SAFE : The ball is fabricated from composite material, the carabiner is manufactured from 304 stainless steel, the webbing is product of Nylon, the ball has many round grooves, so your hands usually are not clean to slip off Package including : Type A: 2* Pull-ups Balls 2* Matching Webbing 2* Stainless Steel Carabiner 1* Bag Type B: 2* Wooden Grip 4* Matching Webbing 4* Stainless Steel Carabiner 1* Bag