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Coming from Project RC in collaboration with BM is an HYPER hard on-road clutch spring. The item is made of high quality GERMAN carbon steel wire and underwent several hardening processes which results in exceptional durability over a long time and thus a reliable clutch setting run after run which is further helped by the machining of the inner portion which improves the seat of the spring. The HYPER hard spring is usable for both .12 and .21 engines on high grip track.
