Mobile Fidelity Master Sleeves - These are the same high-quality inner sleeves used by Mobile Fidelity Sound Lab for their 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. This equals or surpasses the discontinued VRP inner sleeves. Sold in packs of 50.