YAJU This finger trainer is designed for all instrumentalists to develops the strength and dexterity of fingers, hands and forearms.Widely used for finger exercise when you play guitar,piano or orchestral instruments. Simulation: The depth of pressing the key is basically the same as the piano, about 10mm.The new 5-finger button design gives you more practice and a richer fingertip span practice. Improve the strength and speed of your fingers and traning your fingers to be more nimble while playing musical instruments.There is silicone at the bottom, non-slip and easy to operate for beginners. Anti-broken Design: Anti-broken finger design, which is for correcting hand shape.Perfect tool for warm up before playing. Visable physical force adjustment, you can see the change while you practise.Perfect tool for pre-show warm-ups and maintaining conditioning when away from your instrumen. Colour: blue Product includes: 2pcs Size: 12*10cm Notes: Please allow 1-3cm error, due to manual measurement, please make sure you dont mind before bidding. Due to the difference between different monitors, the picture may not reflect the actual colour of the item. Thank you for your support