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 effect2.Please allow 1-3cm deviation due to manual measurement Description:Material: ABS+TPR+metal partsSize: 11*15cmSpring diameter: 2.5mm