Reusable & TransparentMade of high quality PVC eco-friendly material, transparent just like printed on keys, removable but won't leave any residue and won't damage your keyboards. Universal & AttentiveIncludes 52 colorful /black stickers for white keys and 36 notes for black keys, total 88 stickers. Keyboard stickers fit for the most pianos includes 37/49/54/61/88 keys. Clear & ImpressiveThe piano key labels are printed under the topmost layer to prevent fading of the ink; Colorful bigger letters and staffs in bold help kids or beginners get familiar with the keyboards faster and improve the efficiency of practice greatly. Easy to Install & Thinner MaterialThe 2 guides on the upper right corner and the lower right corner could help you install them within minutes. Piano key stickers are 50% thinner than regular ones. You nearly can not feel the existence of them. Customer Satisfaction GuaranteeCustomer Satisfaction is our priority, and we always strive to provide the top quality product and the warmest service for customers. If you are not satisfied with our product, please contact us, we are ready for help