Sold as a pack of 6.Olfa COB-1 Snap-off replacement Blade for use with Olfa compass circle cutters, makes perfect circles every time. Easy to useFits Olfa CMP-1Olfa CMP-1/DXBlade Specification5mm Cutting edge24.5mm Length9mm width0.5mm Thickness3 Blade Pack15 Snap of BladesPerfect for crafts, model making, photography, scrap-booking, memory books and sign-making. Specially honed for long..