Review on 🔪 CRAFTSMAN Utility Knife Blades: 100 Pack (CMHT11921A) - Durable & Versatile Cutting Tools for Various Applications by Carlos Long

They're sharp and made of carbon steel. They arrived quickly and are made in the USA but likely use Chinese steel as they are marked "Made in the USA with Global Materials". It's carbon steel, no doubt, and the blades are tough enough to snap or bend, and hold their edge just as well as any budget blade. Many people test sharpness by cutting paper or shaving their hair. To sharpen a knife. For me the easiest way to check this is to bring a sharp edge to the hair at the back of your head and check for a bite. If it bites immediately, the edge shaves and cuts well. There is no need to cut the hair, you just see if the blade bites into the hair with a little pressure.