If you mean the black and yellow pit boxes, they are PolyButler (or Poly-Butler or something like this) pit boxes... these have been around for ages, over 20 years I think
I do have one, but no idea where you could actually get one these days, haven't seen them for sale a long time, maybe they are discontinued?
Just to clear things up, Schumacher has never produced them... they have maybe sold them at some point in time, but I don't remember that either (and I've been working with Schumacher from '97 or so).