NKOK Seems to be a primarily 'vehicle toy company', but they came on board for Sonic figures around the time of the Sonic Sega All Stars Racing & Racing Transformed games. It was a nice fit, because of all the various vehicles, both the cars & etc it started with and later the transforming ones. They made die-cast metal things, plastic pull n' go toys, and some RC Battery operated items too. 

A Figure-8 typical slot type racing set with Sonic vs Knuckles from All Stars Racing.. It's Sonic in Speed Star & Knuckles in LandBreaker vehicles which you can race with the included (seen in in the middle there) very simple controllers. These sets will let the cars fly off the track if you don't take the 'corners' properly, making them slightly difficult to use well or for extended periods. Likely to be found at TRU in Fall 2012.