7.2cm Pull Up Balls Cannonball Grips for Finger Trainer Grip Strength Training Arm Muscles Barbells Gym Hand Grip Ball Exerciser.    Features: 1.EXTREME GRIP STRENGTH TRAINING-Pair of 2 balls with matching webbing for training grip strength, rock-climbing, American Ninja Warrior training, Parkour, Crossfit, obstacle racing, Grappling and more   2.FULL VERSATILITY: Our climbing holds can be used in a variety of different style workouts and an infinite number of exercises. Simply wrap the strap around a bar, dumbbell or barbell and execute your favourite exercises.  3.DURABLE & SAFE: The ball is made of composite material, the carabiner is made of 304 stainless steel, the webbing is made of Nylon, the ball has many spherical grooves, so your hands are not easy to slip off.    Specification: Material: PU;  Size: Ball diameter 7.2cm;    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;