Tree reintroduced this sprocket after lots of public demand. This is the sprocket that changed the BMX sprocket market and is currently the strongest sprocket available! 

It has 5 different crank arm bolt positions to help extent the life of the sprocket. The sprocket is machined in a way that removes material from the triangle shaped holes that is not needed and leaves the material necessary to form a structure of high strength to weight. Classic looking design has a timeless appeal.