Supersprox-stealth is about longer life, without compromising weight. Primary goal, to last 3 times longer than aluminum and remain as light as possible. It's about performance and function first and last. This sprocket was developed for riding in extreme conditions, where aluminum sprockets can't handle the torque delivered through the chain drive system. It will last 3 times longer than an aluminum sprocket and is between 10-50% lighter than a steel sprocket! That is why they are used by factory and pro teams.