These are the same high-quality inner sleeves MOFI uses for their most-prized vinyl releases. They are imported, three-ply, anti-static, premium sleeves (similar to rice paper) and work with both LPs and laser discs. Back construction consists of a paper layer sandwiched between two sheets of high-density polyethylene (HDPE) with a translucent HDPE front. These custom-designed inner sleeves protect against scratching, static build-up and contamination; all common problems associated with regular sleeves of all types. Your records are irreplaceable. These sleeves will guarantee they last a lifetime.