Reusable and Transparent: Made from high-quality, eco-friendly PVC material, these transparent stickers clearly display the printed notes. They are removable, leaving no sticky residue and won't damage your keyboard. Universal and Comprehensive: Includes 52 colorful stickers for white keys and 36 notes for black keys, totaling 88 stickers. Suitable for most pianos with 37/49/54/61/88 keys. Clear and Impressive: The letters on the piano keys are placed under the top layer to prevent ink from fading. Colorful, larger letters and bold stickers help children or beginners familiarize themselves with the keyboard faster, significantly improving practice efficiency. Easy to Install and Thinner Material: The 2 guides in the upper right and lower right corners help you install them in minutes. These piano key stickers are 50% thinner than regular ones, making them virtually undetectable while playing.