The Polypropylene Sheet Protector is the time-tested standard for artwork presentation. Made in the USA of inert, heat resistant and chemically stable archival quality .0045 polypropylene, these sheets pass the PAT test and feature a non-stick finish to prevent adhesion to your artwork. Available in 5 standard formats, the sheets are top-loading and are sold in packs of 10 in a protective metallic resealable bag.