The Standard for Vinyl LP Protection and Storage: Mobile Fidelity Sound Lab Original Master Record Inner Sleeves Have a Three-Ply, Anti-Static Design for Unparalleled Quality 

Often imitated and never duplicated, Mobile Fidelity Sound Lab Original Master Record Inner Sleeves offer the finest protection for your valuable vinyl LPs. The imported, three-ply, anti-static, premium inner sleeves have been used in Mobile Fidelity Sound Lab LP packaging for more than 40 years and remain the industry standard. Featuring construction that involves a paper layer sandwiched between two sheets of high-density polyethylene (HDPE) with a translucent HDPE front, they are trusted by countless music lovers. There's no easier or smarter way to safeguard your vinyl.

Sold in packs of 50 sleeves. 

“Offered for decades, Mobile Fidelity's familiar rice-paper-style inner sleeves are renowned for their anti-static properties that avoid drawing dust and grit into the delicate grooves. They remain the archival sleeves to beat.”
—The Absolute Sound, Editors’ Choice Award

"Until you've tried actually tried them, you won't understand how much better these are than the standard inner sleeve. Records slip in and out very easily. They don't crumple and are non-abrasive."
—Gear Patrol, The 8 Best Vinyl Accessories