Using these Melissa & Doug Sticker Wow! Unicorn Refill Stickers is super easy. First, take the stack of 300 assorted unicorn - themed stickers and pop it into any Sticker WOW! Sticker Stamper cartridge. Then you can start stamping wherever and whenever you want. Since there are 100 unique designs in each stack, you'll always get a surprise with every stamp. These stickers are great for arts and crafts projects, so let your creativity flow. Just peel them off easily and stick them on your crafts. When it comes to fidget fun, you can keep playing with these stickers to satisfy your need for something to do with your hands. Now, here are some important things to note. This product has small parts, so it's a choking hazard for kids under 3 years old. Keep it away from them. As for maintenance, just store the sticker stack in a dry and cool place to keep the stickers in good condition. That way, you can keep enjoying these awesome unicorn stickers for a long time.