I have heard reports the woodland scenics "fine ballast" is still quite large for n-scale. I tried using it, and although my attempts to ballast some test track failed due to improper ballasting techniques, I still thought the ballast quite large. Another thing is they don't have enough colors between their grey and their black. I was looking at Arizona Rock & Mineral Co. ballast which has better color selection and they call their ballast extra fine. Which is actually finer between woodland scenics and Arizona Rock & Mineral. Which do you use?