fitactic 4 inches rock climbing solid training cannonball bomb power pull up ball hold grips for straps for finger, forearm, biceps, back muscles (2 balls, black 4") fitactic ▼ 4 inches, 2 black balls. ▼ sanding may be required depending on desired roughness on ball surface. includes: 4" diameter power ball + nylon webbing. color red may vary from the images. come with real stainless steel hanger hook + free reinforced nylon webbing. install anywhere! ▼ fun, safe, durable, open-hand design. muscles tendons lay ergonomically & train efficiently. excellent to add into your workout routine. ★for safety, please use under height limit 7 feet. (cushion pad underneath recommended) ▼ spherical shape increases forearm and grip strength, boosting endurance. a must have for rock climbers and extreme sports such as ninja warrior, sasuke players, spartan race. seamless flawless ball surface. ▼ switch from pull-up, to chin-up, to biceps-pull without regrouping. webbing strap is not installed in box, please follow the image to hang it on. ▼ 4" power ball, ideal for normal / bigger / men hands, or finger & palm training.