Ultimate Muscle
The line was launched in Japan in 1983, and licensed in 1985 for the American market as M.U.S.C.L.E. (reflecting "Kinnikuman's" English title of "Muscleman"). M.U.S.C.L.E. used a harder rubber than Kinkeshi; its U.S. sequel, Ultimate Muscle, had a small release of about twenty Kinkeshi, though a larger run of figures using a plastic softer than M.U.S.C.L.E. but not eraser-like was released exclusively in the USA.