These archival quality high denisty stabilized polyethylene (HDPE) plastic sleeves provide the best possible protection against dust and scratches. They do not sweat like low density innersleeves and stand up nicely inside the jacket. These are the heaviest and best we've seen! These static free sleeves cover the vinyl & slide into the jacket. Each sleeve measures 7-1/8" x 7" (or 181mm x 178mm) Archival Quality, Static Free High Density Stabilized Polyethylene Plastic Heavy Duty 3mil Thick Fits Single 7" Records Flush Cut with Slight Lip for Easier Insertion Maximum Protection