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 and lime version, made like this to be similar in look to the standard Bee. 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.