Tyvek Sleeves with Window and Flap. Sleeve color: white.Sleeves have a clear, glassine window, to view the enclosed disc. Tyvek material, wet or dry, is strong and durable. It resists the signs of aging, and is tear resistant. The smooth, non-abrasive surface yields the highest protection against scratching, dust and lint!Flap is ungummed. 100gram weight. Designed to hold a standard 120mm disc.