219 Kart Sprockets 7075-T6 AluminumAvailable in sizes 70T through 89TTHe color is currently red and will be replaced with the color black as the red sell out!Kart-Master sprockets are stronger, lighter and longer lasting than standard grade 6061-T6 aluminum sprockets. They are built out of premium grade 7075-T6 aircraft aluminum because there is no better grade of aluminum for making sprockets. Once you run 7075-T6, you’ll never go back. Most racing kart sprockets, are made from 6061-T6 aluminum, a softer, less expensive grade of aluminum. New Kart Master 219 Pitch Sprockets / Gears. Kart Master #219 Sprockets are Super Lightweight; weighing from just 5oz. each. Made of the highest quality 7075-T6 aircraft grade aluminum. Machined and hobbed for accuracy.