In case they need a reminder! 

These stickers are printed on durable, high opacity adhesive vinyl which makes them perfect for regular use, as well as for covering other stickers or paint. The high-quality vinyl ensures there are no bubbles when applying the stickers.

•  High opacity film that’s impossible to see through
•  Fast and easy bubble-free application
•  Durable vinyl, perfect for indoor use

Don't forget to clean the surface before applying the sticker.