In addition, injection molding for plastics required much less cool-down time for the toys, because the plastic is not completely melted before injected into the molds. Hendry also developed the first gas-assisted injection molding process in the 1970s, which permitted the production of complex, hollow prizes that cooled quickly. This greatly improved design flexibility as well as the strength and finish of manufactured parts while reducing production time, cost, weight, and waste.[10]