Originally Posted by davei
Yes, we use metal salts to add weight.
not sure if this means anything in the way that you're describing...
from the LED thing on the home page...
"...- Besides glow discs that have been around for 20 years, there are some discs containing LEDs designed for night play on the market like those from Black Jax Sports pictured below. However, the Black Jax Quest and any other LED models currently do not yet meet PDGA specs, primarily because they contain metal.