Item Type: Pull Up Balls Material: PU + Steel1Manufacturing Material: This pull up grip ball is made of anti slip PU material, with concave and convex appearance, very comfortable and durable. 2Free Weight Adjustment: Can be combined with DIY tray exercises, free weight adjustment, for wrist strengthening, suitable for wrist, hand and finger strength training, training your forearm and grip. 3High Performance: Can be combined with pendant webbing, pull up fitness pendant can be used for strength training, increase forearm muscles and grip, exercise climbing ability, improve endurance and explosive force. 4Perfect Fitness Choice: This is the perfect choice for people who want to build up their forearm muscles and grip, the ideal fitness equipment accessory. 5Versatile Use: An ideal set for athletes, rock climbing enthusiasts, wrestlers, gymnasts, parkour trainers and anyone who wants to gain grip strength. All items fit inside the carrying bag for workout sessions at home or on the go. 2 xGrip Ball