The Astatic N350 series features replacement phonograph needle styli designed for LP record playback on legacy General Electric (G.E.) RPJ-style phono cartridges. The N350-1D option includes a 1.0 mil diamond tip for G.E. LP cartridges, cross-referencing part numbers A-179D, W-68MGD, RPJ-01D, 418D, 661D, and 2728D. The N350-1S option includes a 1.0 mil sapphire tip, cross-referencing part numbers G1, A-179, W-68MGS, RPJ-01S, 418, 661, and G.E. 61S.