The X-Ray Bee was a special release from Playmaxx. Playmaxx had just filled a special order to Hyper Yo-Yo of Japan for their Hyper Wasp, and made some extra parts for this special release. In my opinion, the most beautiful Bees ever made. These came in a special plastic box with lots of extras. Only about 800 X-Ray Bees were made.
Pictured here is the Smoke version, sort of a translucent black or dark grey. Notice the logo shows the domain name of www.proyo.com. An earlier very limited release of the X-Ray Bee was sold only at the Proyo Worlds in 1999, and did not have the domain name on that logo.