Features: Make of silicone, soft and flexible. Enable player to maintain a natural and comfortable grip. Violin Bows Grip Correcting Device is designed to Bend the thumb, allowing it to comfortably touch the intersections of 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 performances. Violin Bows Grip Correcting Device comes in a universals size that fits both child and adult hand sizes. Specifications: Materials: Silicone Color: Orange/Black/Blue/Green/Redness Size: As shown in the picture Package Includes: 1set Violin Bows Grip Corrector 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.