Up to five times sharper than conventional blades, ResidueRazor disc blades are specifically engineered to manage new genertically engineered (BT) corn and soybean varieties as well as wheat and barley straw. Manufactured with time-tested Ingersoll proprietary Boron, ResidueRazor disc blades resist chipping and cracking in rocky conditions and penetration in hard soil conditions is unparalleled.