Upgrade your 12" record protection with HumminGuru rice paper-lined MASTER sleeves. They deliver the ultimate protection with 3+1 layers, including 3 layers of 30-micron HDPE and a layer of archival rice paper. Crafted from heavy-duty 7 MIL high-density Polyethylene, these master sleeves provide a superior barrier against dust, dirt, and static. Measuring 12 1/8" x 12 1/8" (30.8 x 30.8 cm), the 50-pack offers great value while ensuring archival quality, acid-free, and anti-static protection.