Comparable to the Wilson Gold Seal, the 440SS12 has high precision machined profile curves, 8 cross cut teeth at 60 degree angles and is 30 grams lighter than our competitors. The 440C stainless steel runners are made in the USA and are the longest lasting in the world. Blades are tapered thick in front to thin in back. The solid aircraft aluminum holder has no hollow sections hidden inside. They are the strongest and stiffest blades in the world.