GLASS VAN & TECHNOCUT Surgical Blades. Made from the premium quality Swiss steel. Available in 10, 11, 12, 15 size for small size fittings (Handle No.3) & in 20, 21, 22, 23, 24, & 25 sizes for large size fittings (Handle No.4). Treated with Gamma radiation of 2.5 Mrad to ensure sterility assurance level of 10-6. Blades are individually packed in an aluminum peel-able package which is protected by VCI coated paper lining.