Features 1. 5-100KG Grip Strength Trainer, Wrist Expansion and Stress Reduction Fitness Gym Training 2. High strength thick springs are sturdy and durable, made of stainless steel material, wear-resistant and rust free, with good temperature resistance, impact resistance, and a long service life without fracture. 3. Thoughtful design: The TPR handle adopts ergonomic design, anti slip grip, and fits every finger. 4. Appearance and performance: Automatic cutting, smooth edges, suitable for most road bikes, delicate texture. 5. Compatibility: The easy to install grip trainer has a smooth surface and exquisite workmanship, suitable for most bicycles. Specification Name: Adjustable Grip Strength Device Product Material: PP+High Carbon Precisions Steel Spring diameter: approximately 4mm Strength: 5-100KG Product size: Approximately 11cm x 16cm in length Package Include: 1x Grip Strength Gym