Features: Made of silicone, soft and flexible. Enable players to maintain a natural and comfortable grip. Violin Bow Grip Correcting Device is designed to Bend the thumb, allowing it to comfortably touch the intersection of the stick. This promotes proper hand positioning and technique while playing the instrument. This ensures that the player has proper control and stability, resulting in improved overall performance. Violin Bow Grip Correcting Device comes in a universal size that fits both child and adult hand sizes. Specifications: Materials: Silicone Color: Orange/Black/Red/Blue/Green Size: about 3.2x2.3cm/1.26x0.90inch Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1pc Violin Bow Grip Corrector