Features: *High Quality Material: This product is made of high quality material, not easy to break, reusable and durable. *Adjustables: Innovative compression spring, this Grip Strength Trainers can adjust the resistances without changing the grip distance. *Safe use: This Grip Strength Trainers is designed with hiddens spring metal parts to protecting the limbs from injury in all way. *Soft and non-slip: Ergonomic handle design, soft rubber covering the palm contact position, so that your hands will not be rubbed during exercise. *Easy to carry: Portable and lightweight design, you can easily put it into your pocket or backpack, you can carry these handles with you to exercise anytime and anywhere. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Material: ABS+TPR+metal parts Size: 11*15cm Spring diameter: 2.5mm Package List: 1 x Hand Grip Strengthener