These outer sleeves are designed from premium plastic to ensure your sleeves dont split. Our 4 Mil thick Polyethelene is softer than tradition plastic used on sleeves and has Anti-Static properties. These sleeves were designed for the serious collector who wants to protect their investment. We desgined our sleeves a few mm smaller than the normal baggy one size fits all generic sleeve for the perfect fit on single lp records and slim fit on 2lp gatefolds.