This yo-yo model came in the standard--and more common--purple body. It also came in a hard-to-find black version as seen in this exhibit. Just one black version was packed per case of yo-yos, although it is unknown how many were in a case.
The Grim Sleeper is a CAD yo made by a manufacturer known mainly for their radio controlled cars. This model of yo-yo was originally released in October, 1998 a few weeks before Halloween.
