The TL is the brother of the reliable TeeBird. This disc has the same great speed and glide as the Teebird, but is straighter flying with less fade at the end of the flight. 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.