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.<br> Universal & AttentiveIncludes 52 colorful stickers for white keys and 36 notes for black keys, total 88 stickers. keyboard stickers fit for the most pianos includes 49/54/61/88 keys.<br> 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.<br> 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.<br>