The Stinger Killer Bee is made from knife-grade stainless steel and comes razor sharp right out of the package. The ferule is made from aircraft quality aluminum and is spin-tested within .002 of an inch. The patented diamond tip provides bone splitting penetration on the worlds largest animals. 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.