Believe it or not, the production of double-edged razor blades used for shaving is pretty complicated…and we’ve come a long way since cavemen used sharpened pieces of flint to shave their faces.

This video gets into the nitty-gritty of how our modern razor blades are made from stainless steel strips that are only four one-thousandths of an inch thick.

This segment comes to us from the How It’s Made show on the Science Channel.