The Black Hornet Ser-Razor incorporates a chiseled serration for more effective cutting inside an animal, which equals greater blood trails. The Ser-Razor is made from knife-grade stainless steel and is shaving sharp right out of the package. It is precision-machined and spin-tested right out of the packaging. This head is also backed by Magnus's no-questions asked lifetime guarantee, so you know this broadhead is designed perform. Superior penetration, excellent blood trails, and a lifetime guarantee make this broadhead the perfect choice for today's demanding bowhunter.