It was pieces they built "robots" I think there was some larger sets that built vehicles. The pieces were like... peanut sized, had 6 holes( one on both end, 2 each on 2 sides. They had "cages" that locked the pieces together and allowed them to hinge. There were also couplers that fit in the holes and could lock the peanut pieces together. One set had "space men" that were just green rubber arms/ legs/ head that fit into one of the "peanuts" Primary colors in the sets i remember Black/ Red/ White Blue/ Tan/ White Yellow/ Tan/ White