They may be thinking of the "uni Jetstream 4&1 Metal Edition" with black/red/bluegreen Jetstream ballpoints, plus a 0.5mm Mechanical Pencil: https://www.amazon.com/uni-Jetstream-Ballpoint-Mechanical-MS... or https://www.jetpens.com/Uni-Jetstream-4-1-Metal-4-Color-0.5-...
Close. I got this one: https://www.jetpens.com/Uni-Jetstream-3-Color-Ballpoint-Mult...
Oh wow, those both look fantastic. I'll see if someplace local might carry these. Thanks for the links, both!