For plastic version, it may be made with ABS (Acrylonitrile Butadiene Styrene) or Heavy Weight (HW) plastics. Though modelguns made with ABS plastics does not look and feel good, they are much cheaper and durable and have better cap blowback performance over metal versions. Most of the ABS plastic models are black in color but some are chrome or nickel plated to replicate the stainless-steel counterparts. The Heavy Weight (a MGC invention) plastic is the ABS resin mixed with some fine metal (usually zinc or iron) powder so that it weighs heavier and looks less plastic. In 1992, MGC released 'Super Real Heavy Weight' or SRH models which were a lot heavier than the normal HW plastic and so look and feel even more realistic. It contained high component ratio of metallic (iron) powder such that it can be attracted to a magnet. Since the SRH material is more brittle, the MGC SRH models were only made for some revolvers and a few dummy semi-auto handguns but sadly the production only last for a short period of several months. However, the idea of SRH is adopted by other modelgun makers later. Kokusai released "Mega Heavy Weight" version, Marushin released "Giga Maxi Weight" version and Hobby Fix also released "Mega Weight" version for some of their products. Real McCoy's, Rampant Classic and Elan produce Rocken brand modelguns with Super Lock Light material (plastic mixed with tungsten powder) which has ultra high specific gravity as iron as well as better strength and finish texture. Elan further develop improved Super Lock Light R2.5 resin for its blowback and dummy Rocken models.