CompatibilityBL2012/BL2013/BL480/BL480D/BL481/BL482/BL486CO/BL487/BL487A/BL488W/BL490/BL491/BL492/BL492W/BL640/BL641/BL642/BL642W/BL642Z/BL680A/BL682/NN100A/NN101/NN102MaterialBlade Replacement Parts: ABS plastic + stainless steel.SpecificationNinja Blade Size: 4"/10CM diameter. Color: Black & silver; Number of Blades Fins: 7.Easy to install and useDirect replacement for a proper fit. 7-fin blades with different angles are very sharp, rust resistant and durable to use.NoteThe rubber gasket in bottom blade maybe loosened during transportation. Before using the bottom blade, please check the rubber gasket and be sure it is put snugly into the replacement bottom blade Our products are made with the splendid quality materials and are designed to provide you with the best possible user experience.