Pyro is an overstable midrange from Axiom, which comes in a very special Prism Neutron plastic. Unlike normal neutron plastic, it comes with a transparent edge on the disc where you get a nice play of colors. In Prism Neutron plastic, you get a premium disc which is very durable and which you can use for many years.
In the Dyers Delight edition, you get a completely white disc in Prism Neutron plastic without a stamp on the upper side. It is therefore particularly suitable for painting yourself. Painting discs has become a popular hobby for many disc golf players, and is also called "custom dye". In neutron plastic, you get a disc that absorbs color particularly well.