Clear CPP Plastic 120-Micron Thick Sleeves with Flap & Side Stitching. Sleeve color: clear. Made from cast polypropylene (CPP) material, which allows for a flexible, but rigid sleeve. 120-micron thickness, with side 'stitching', for extra strength.Thickness: 120 microns / 4.72 mil.Designed to hold a standard 120mm disc.