Brady's durable PermaShield labels are protected by a clear overlaminate film, so they remain clear and easy-to-read, even in harsh environments. Application of these labels is very easy. Simply print the label, then put the label in place and cover with the clear polyester (B-966B) overlaminate. Please Note: This material is UL, CSA & AGA approved with its respective ribbon. See the "Recommended Ribbon Series" for the appropriate ribbon to use.