2.9-mil 2-ply treated polyester (UVPET) Rated at 5 year outdoor exposure UV blocking (meets/exceeds ratings for UV blocking) Unique 2-ply format allows for convenient and trouble free application Round corners design reduces lifting and keeps edges from curling Guards against yellowing, fading and aging caused by ultraviolet, fluorescent and natural lighting Guards against yellowing, fading and aging caused by ultraviolet, fluorescent and natural lighting. 200 labels per roll