The Standard for Vinyl LP Protection and Storage: Mobile Fidelity Sound Lab Original Master Record Inner Sleeves Feature 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 all of your valuable vinyl LPs. These imported, three-ply, anti-static, premium record sleeves have been used in MFSL LP packaging for more than 35 years and remain the industry standard. These recommended record sleeves are personally used by more music reviewers, record labels, and music lovers than any kind. Try a set and see why these sleeves are the best-selling sleeves in the world. (Sold in packages 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