Same as their SPS-1 . Should have their brown N11 stylus- a 0.2 x 0.7 mil elliptical. Recommended tracking force is 0.75 to 1.5 grams. You can use any SPS series stylus- the orange N12 also is a 0.2 x 0.7 mil with same tracking force spec. and the upgrade would be the N15 Hyperelliptical.
It's a good stylus, and you won't see that shade of green again anytime soon.