Great for the young gal with something to say. These vibrant pink letters and punctuation marks help to get the message across when she's not even around. Whether it's just to mark some property or to let you know what's up, it's a fun and educational way to communicate silently. The stickers themselves are removable, reusable, and leave no residue on any surface. The clever adhesive makes them usable for years without any noticeable change in stickiness.These stickers will work on just about any surface, but take care with wallpaper or some delicate surfaces. If in doubt, test in an inconspicuous place prior to applying all the stickers. Also, wait 10 to 15 days after painting before using stickers. Though the paint feels dry, it needs adequate time to cure. As with any adhesive product, these will work much better on clean surfaces free of dust and the like. Specifically, they will work well on surfaces including but not limited to walls, mirrors, your fridge, laptop covers, tile, glass, lockers, furniture, and automotive surfaces.Please note this product does not ship to Pennsylvania.