Complete set: the hand strengthener kit has an adjustable gripper, finger exerciser, finger stretcher, strength ring, and pressure relief grip ball for hand therapy. the set comes in a practical and travel-friendly carrying bag adjustable strength & counter: the upgraded hand gripper features an integrated mechanical counter that records the exerciser number and a rotating button to clear the units. with a non-slip handgrip, the resistance is adjustable from 5-60 kg durable design: grip strength trainer features an ergonomic design with imperishable materials that are health-friendly. the combination of plastic, abs, silicone and tpr, an a-grade material, which will provide great toleration under pressure and won't break after use