Shocks, GTM, 6061-T6 aluminum (anodized) (fully assembled w/o springs) (4) Take your TRX-4M to the next level with big-truck suspension technology. Heavy-duty GTM shocks are made from tough 6061-T6 aluminum and anodized with a brilliant finish. Give your TRX-4M long-lasting reliability and smoother suspension travel with these high-quality dampers. Shocks are sold assembled as a set of four with pre-load spacers (4). Springs sold separately. 1/18 Bronco 1/18 Defender