Here's a Sonic themed 24 colored pen set, with Sonic Vs. Metal Sonic theme. It SEEMS to be from around the Sonic CD era (when this very well done art was quite popular) however, you'll notice Knuckles on the package as well...so a better guess would be somewhere near Sonic 3. These are done by Tombo, the popular pen and pencil company.

For just a set of pens, this thing sure is dramatic! A big well done rendition of the fight secene, Sonic Tails and Knuckles all making an appearance with a nice 3D font. Since this is a 'usable item' it isn't common...though it would be great to collect.