Plain This Side Up Label designed by us, has a durable adhesive that allows it to attach to cartons, glass, corrugated cardboard, plastic, wood, and other surfaces. The generally recognized designs on this label is clearly indicating which side of your product must be kept up. Besides, our Plain This Side Up Label is made of a semi-glossy material paper label material. To provide the stickers more visibility to package handlers, they're printed on a bright paper label sheet. This is very effective and safe to use.