Details Polished Convex Blades Silky Cut Performance Pure Japanese Steel 40-Tooth The Edge Ahead 40 Teeth Smooth Thinner was designed to thin hair with a silky cut performance, made with pure Japanese steel and polished convex blades. Pro Tips Wipe your shear blades daily with a soft, dry cloth to remove moisture and fragments of hair. Put a drop of oil between the blades while opening and closing the shears several times. Wipe any excess oil before the next use. Store in a dry place. Avoid dropping or bringing shears into contact with hard objects. Use these shears only to cut hair.