Stickers perform best on smooth, dry surfaces such as laptops, phones, binders/notebooks, mirrors, etc. You can put them on water bottles and other cups you hand wash, but do so at your own risk These stickers are water resistant (not waterproof) with laminate on top for extra protection. Size: 3" x 3" Finish: choose from glossy, holographic, or glittery (holographic star pattern) *FOR BEST RESULTS * 1. Choose a smooth surface and be sure to clean and allow it to dry thoroughly. 2. Carefully peel the sticker from its backing. 3. Press the sticker firmly in place. 4. Allow recommended 24 hours for sticker adhesive to “cure” before further handling or hand washing. *Stickers are handmade so tiny imperfections could appear. I do thoroughly examine every sticker before it's packaged.* *Designs are a combination of my own designs and/or purchased designs and elements from other talented designers and small business owners. Your purchase supports my small business as well as others!*