Our UV Stickers are printed on 60 lb. Gloss Coated Crack and Peel BOPP. BOPP stands for biaxially oriented polypropylene which is a film that is naturally resistant to UV rays and has an amazing resistance to chemicals and abrasion. The UV Stickers are printed in vibrant CYMK color and have a glossy UV resistant surface. These labels are best used in indoor applications great for uses for packaging, and handing out as swag at events.