Includes sound absorbing upper shell for quiet operation, stainless steel shredder ring, and grinding elements with 360 stainless steel swivel impellers with ABS (plastic) grind chamber, permanently lubricated bearings, and Quick lock mounting assembly for faster, easier installation. Also includes overload protection switch with manual reset, self service wrench to free simple jams, corrosion resistant sink flange, corrosion protection shield, dishwasher drain connection, and 1 piece plastic stopper. 4 year warranty.