Baart Industrial Group is a great American company that manufactures power transmission products of the highest quality. Take their BlackStar sprockets, for example. These sprockets are all made from solid steel and hardened teeth come standard. With other manufacturers, the sprockets you buy may be sintered steel, which is much less dense.
Online, we only offer QD-type single sprockets. All other types can be ordered by calling 800-692-4474.