Custom stickers are mostly used stickers today because these are used for many purposes. Custom stickers are made by different techniques and they have different types like die cut, vinyl material and self-adhesive. People use custom stickers for advertising or promotional purpose
Sandwich stickers are not like sandwich it means that this sticker is between 2 layers of paper. One is place on back of the sticker for safety and second is printed with the sticker. Sandwich stickers can be applied on any surface. Sandwich stickers are made of non-removable ink so they are more durable than other stickers.