Feather Replacement Cartridges SE-8 For Feather Triple Blade Razor 8 Pack. These blade refills are coated with SIC ceramic. SiC Ceramic coating technology offers durability, longevity, avoidance of rust, and comfortable shave. Each single blade moves so that the blades hold only hair and disperse pressure on the edge while easing the strain on your skin. Reduces the possibility of skin irritation and razor burns.