These archival envelopes make an excellent collectable trading card holder and protector to store your baseball, football, Pokemon or any other trading cards. Crystal clear art protectors are an ideal way to present, protect and store sports collector cards and wallet size photos. Package contains 100 bags. 3.6 mil (BOPP) biaxially oriented polypropylene is completely archival and safe for long-term storage. Reusable adhesive strip designed to withstand repeated opening and closing. Adhesive strip is placed on the body (not flap) of the Art Protector to aid in safely inserting and removing art work. Sealed on 3 sides and opening on short side with 2" flap. Dimensions: 2-11/16" x 3-9/16". PAT passed