This is basically a 3-grit emery board, but unlike the cheap emery boards, it has finer grits. The coarse is about 400 grit, great for smoothing mold lines. The Medium puts a slight shine on plastic, and the fine does what it says- polishes! I'll be buying more of these when this one wears out.

I bought 2 of these,just to avoid using one up and not having it when I need it. It works so well that I use it all the time, on about 7 projects so far and it still looks and works like new.

These things work great for detail work on plastic styrene models, I use them for polishing out panel seams on wings and fuselages and other seams. I recommend 100%.