There is a new biodredable bb too from Bioval, and this one a flourescent. I don't know if these are luminous ones which exposure to light is required for these to work. But if they don't need them, this is a wonderful replacement for tracer bbs... "BIOVAL is presenting yet another sort of BBB's, the long awaited BBBFLUO! These fluorescent BBB's come in weights of 0.20gr and 0.25gr with a size of 5,920 mm. These are high quality, cost effective fluorescent bb's! Find more information at your local dealer of distributor. They will be available around summer 2008, to enjoy your summer night games!"