The number one professional mid-range disc. It is very reliable at the high speeds that pros throw. It ages slowly, becoming an excellent slow turning disc as it wears. DX Glow in the Dark. These discs are affordably priced and provide an excellent grip in a variety of weather situations. DX discs wear in with usage and over time will eventually take on new and varied flight characteristics. Many top pros carry several DX discs of their favorite models to provide different flight patterns for different situations.