Package Content: Each contains 1 sheet colorful transparent piano sticker, the size of a single sticker is 25x15mm, suitable for most piano keyboards. Essentials for Beginners: Improve childrens interest in piano learning, quickly memorize piano sounds, and practice on their own without the company of teachers and parents. Paste without Leaving Glue: The combination of multi-layer processes and the use of environmentally friendly materials can be repeatedly pulled and pasted without leaving glue marks. Easy to use: Use scissors to cut the stickers one by one, tear off a part first, then align them along the edge of the keys, and then slowly smooth the stickers. Wide Applications: Suitable for most pianos such as 88/61/54/49-key pianos, electronic pianos, hand-rolled pianos, etc. It is very useful for beginners and children.