Feature: 1. Multi Finger Enhancement: Our finger strengthener comes with five key buttons that allow you to have richer finger span practice, increase finger strength, let you play more smoothly. 2. Comfortable and Anti Slip: Crafted with soft, eco friendly silicone, the grip strengthener features top and bottom button designed for comfortable use and anti slip design. 3. Durable: Made of pure copper core, ABS, silicone and metal materials, piano finger exerciser s are durable and easy to use for users of all ages. 4. Adjustable Tension and Buckle: With 2 buckle, you can hold down any two buttons, feel free to choose the finger you want to exercise; 3‑8.5 lb tension adjustable. 5. Portable Size: Our finger strengthener is compact and slim, easily fitting into the palm of your hand. You can keep your grip strengthener with you wherever you go Specification: Item Type: Finger Strengthener Material: ABS, Silicone, Copper Core, Metal Tension: Adjustable 3-8.5lbs Function: Practice finger tension and flexibility. Package List: 1 x Finger Strengthener2 x Buckle