Reusable & TransparentMade of high quality PVC eco-friendly material, transparent just like printed on keys, removable but won't leave any traces of glue and won't damage your keyboards. Universal & AttentiveIncludes 52 colorful stickers for white keys and 36 notes for black keys, total 88 stickers. Fansjoy keyboard stickers fit for the most pianos includes 49/54/61/88 keys. Clear & ImpressiveThe piano key labels are printed under the topmost layer to prevent fading of the ink; Black 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. Fansjoy 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. If you are not satisfied with our product, we are ready to help