Using these Melissa & Doug Sticker Wow Dinosaur Refill Stickers is super easy. First, take the stack of 300 stickers and drop it into any Sticker WOW! Sticker Stamper cartridge. Then, you can start stamping on any surface you like, whenever you want. Each sticker stamped will be a surprise as there are 100 unique prehistoric - themed designs in the stack. When it comes to creative projects, just use your imagination and stick the stamps wherever you want. Remember, these stickers are not reusable, but if you need to remove them, they come off easily. As for maintenance, keep the sticker stack in a dry place to avoid damage. And most importantly, this product has small parts, so it's a choking hazard. Keep it away from children under 3 years old.