Printed on eco-friendly PVC material and coated with a long-lasting material that will not damage the keys of the instrument. The letters and staff on the piano stickers are bold and raised too big enough. They are printed under the top layer to prevent ink fading, making it easier for kids and beginners to recognize and play. Includes 52 white key stickers and 36 black key notes, 88 stickers in total . The keyboard stickers for most pianos include 37/49/54/61/88 keys. The instructions can help you apply the stickers in minutes. These come with durable adhesive and will not damage keyboards Thanks to the multi-layer coating process, the surface of the sticker is smooth and can be easily wiped with a cloth. Of course it can also be removed without leaving any residuec High quality material Clear letters and notes Universal & Attentive Apply and remove Easy to clean