Yo! Bones was part of a special Halloween release by Hummingbird. There were three models in the Halloween Series... Yo! Bones, Yo! Cats, and Yo! Jack. The Halloween Series were a smaller release, and quite difficult to find. Most of the Yo! Bones model were black with a silver foil logo, but there are variations.
Shown here is a more unusual color, Neon Pink with black logo.