Features:Material: Kalimba stickers are made of safe and delicate and waterproof paper materials, which can give you a good accent. Features: Kalimba stickers deepen your memory and comprehension of each note and keyboard position, improving your learning progress. Easy to paste and delete: When you don't need it in the future, you can remove it without leaving any traces. Applicability: Kalimba stickers are perfect for anyone just learning or for someone who needs a freshener for notes that are visually clear, and help you quickly locate your keys when you're trying to learn how to read. Cool Gift: This is a great gift for thumb piano beginners, and it can help you quickly find the right keys. Specifications:Material: StickerColor: As the picture showsPackage weight: approx.5g Type optional: 17 keys/21 keys Size: As the picture showsNote:Please allow 1-2cm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Included:1Pc x Piano Music Stickers