Girp hook Black Style A: Parameters: Material: coated steel hook, rubber, nylon hook&loop Specifications: 37.5*8cm/14.76*3.15in. Weight: 0.55kg per pair Features: It helps your hands, delays hand fatigue and increases training. Suitable for: these with fitness needs, need to increase their grip strength, such as back muscle training, pull-ups, deadlifts and other sports that need to increase grip. Affordability: Each hook can bear maximum weight of 150kg, besides when we use it, the palm is pressed on the hook. hook Black Style B: Specifications:35*8 cm Weight: 0.33kg per pair