POLY-Chrome Translucent BLUE Album Jacket Sleeves 12-11/16 x 12-5/8 2.5 mil Polyethylene. No flap. Fit over 12" LP Jacket. Will NOT hold double album jacket. Polyethylene is a soft clear material that has some give to it. It has excellent contact clarity. Our polyethylene is made from 100% pure virgin material, which has been tested by an independent lab and confirmed as safe for long-term storage. This material does not contain PFAS chemicals (forever chemicals). The recycling symbol #4 indicates that these sleeves are recyclable at most retail and grocery stores.