1. CLEAR LETTERS AND STAFF - The letters and staff on the piano stickers are bold-processed and increased to large enough, printed underneath the top layer to prevent ink from fading, all to make it easier for kids and beginners to recognize and play 2.SUITABLE APPLICATIONS - The piano teachers need the piano stickers, which are perfect tools for teaching kids and beginners, easier to get through basic lessons 3.APPLY AND REMOVE - The instructions could help you install the stickers within minutes, which come with long lasting adhesive, and will not damage keyboards 4.EASY TO CLEAN - Thanks to the multi-layer coating process, the surface of sticker is smooth, which can be easily wiped with a cloth, of course it can also be removed without leaving any residue 5.FULL KEYS SET - 88 Pieces of stickers work for 49/54/61/76/88 keyboards and pianos perfectly, white key sticker measures 1.38 x 0.63 / 35mm x 16mm, black key sticker measures 0.98 x 0.28 / 25mm x 7mm