These stickers are reminder stickers specially designed for beginners of thumb piano, which can help you to become familiar with the keys and form muscle memory. In the early days, beginners usually forget the keys, which makes the piano learning process more difficult. This efficient and practical thumb piano sticker can help you strengthen the memory of the keys and carry out more effective practice activities. Features -Color: White, blue, green. -Material: Paper. -Size: About 12.00X1.50X0.10cm/4.72X0.59X0.04inch. -Lightweight and practical, you will hardly feel them when you play the piano. -The surface of the sticker is smooth, safe and durable, and has an excellent texture. -The stickers are perfectly matched with the keyboard and are clear and easy to read, making thumb piano learning easier. -The bright sticker appearance can help you easily recognize and remember. -You can buy this efficient and practical thumb piano sticker at an . Package list: 20 x scale stickers 20 x white stickers 20 x green stickers