The blades used in the Single Edge are known as injector blades. They are not proprietary to us and have been in production for 100 years. You can find them easily at drug stores and other online retailers. You don't need another blade in your razor - you just need a better one. Step up your shave game with our Single Edge razor blades. Twenty comfort coated blades, packaged in a handy injector cartridge and designed to perfectly fit your Single Edge razor.