Derby professional single sided (half) razor blades are manufactured using Swedish stainless steel and the same process as traditional DE blades. Half blades are perfect for professional use with majority shavettes(can be purchased in our inventory) with black holder, hairdressing trimmers and other equipment designed to use half DE blade. Great economy and savings for personal use with shavette! 100 half are packed loose in cardboard box. Please handle with care to avoid any injuries!