Like all of Mark's UV marbles, this one is made out of 100% uranium glass, and thus it lights up like a Christmas tree on fire when you put a black light on it. Seriously, it is unbelievably bright! Usually when I take the black light pics, I have to set the exposure to either 4 or 8 seconds in order to get enough ultraviolet light in there to light up the UV glass for a good shot. But with Mark's marbles, even ONE second is too much, as you can see in the 2nd picture. Truly amazing glass!!

This marble is one of Mark's awesome James Bond marbles, featuring 3 air traps floating inside - 0 0 7! Ha ha, so awesome, and SOOOO hard to keep a design like this under control while the glass is hot, and yet still so perfect. Mark is such a master!! Signed 'Matthews 2006'.