-Set includes 4 Sizes 12 pieces Please Ring Bell Stickers, Size :1x0.6in,1.5x0.6in,2x0.6in,2.5x0.6in. -Material: Made from vinyl Brushed Silver Sticker, it looks like metal, but it's not metal. The sticker is thin but very strong, waterproof and resistant against scratches. -This Please Ring Bell Sticker let visitor know ring the doorbell first when visiting. It can be posted on your doorbell, or wherever a special reminder is needed. -The stickers are very easy to use, with adhesive on the back, just peel off the release sticker and stick it on.