Feather Double-Edge Safety Razor Blades are a green and cost-efficient alternative to purchasing the disposable, cartridge-based razors. FEATURES Very sharp and long-lasting  Coated in platinum to prevent rust and increase its durability  Compatible with modern double edge safety razors (Merkur, Parker, Edwin Jagger, etc.) NOTE: Feather Black and Yellow, blades are crafted with the same materials. The only difference lies in how they are packaged: black Feathers come in 5-blade packs while each yellow Feather pack includes 10 blades. MATERIALS  Stainless steel Platinum coating  SPECS 1 pack of 10 blades COUNTRY OF ORIGIN Japan