A blade comparable to the MK Phantom, the 440S17 has high precision machined profile curves, 3 single cross cut teeth and is 30 grams lighter than our competitors. The 440C stainless steel runners are made in the USA, the longest lasting runners in the world. The blades are tapered thick in front to thin in back. They have a solid aircraft aluminum holder with no hollow sections inside. The strongest and stiffest blade in the world!