13 1/8" x 12 3/4" (333.38mm x 323.85mm) high clarity sleeve, fits most box sets up to 3/4" thick. We use virgin 1st quality polyethylene on all our sleeves. All sleeves are flush cut at the top. These sleeves are a great choice for protecting your record collection. These are the record industry's material of choice, providing maximum protection from dust and wear. These hold up and protect a record when in a store in many customer's hands, then they'll definitely keep your collection pristine! (Fits Vinyl, LPs, 12" Records) Archival Quality Polyethylene Heavy Duty 3mil Thick Oversize (Fits Most Box Sets Up to 3/4") Flush Cut with Lip for Easier Insertion