Great Value

I purchased Tokyo Pen Shop products over a year ago and I am still using them today. Great value.

Nano Dia



  • Description
  • Reviews

Nano Dia ~ yes, it really does contain millions of 'nano' diamonds per lead! The nano diamonds make this a strong lead, while the oils help improve smoothness. It makes an excellent pairing with the Mitsubishi Kuru Toga. This is one bold lead!

  • Available in .3, .4, .5, .7, and .9
  • .3 = 15 pieces available in H and HB
  • .4 = 30 pieces available in H, HB, and B
  • .5 = 40 pieces available in 2H, H, F, HB, B, and 2B
  • .7 = 40 pieces available in H, HB, and B
  • .9 = 36 pieces available in H, HB, and B


5 of 5 Stars
It's the Porsche of lead. Writes amazingly smooth and lasts forever!
5 of 5 Stars
Nano Dia is really good. I bought four Uni 552 drafting pencils in 0.4 mm lead size and loaded them with the four different lead hardness grades of Nano Dia. After writing several pages, I can't decide which I like best, they all look good. This formulation works well in every grade. I'm keeping Nano Dia in all four pencils for the fun of experimentation!
5 of 5 Stars
By far the best lead I have ever used. Writes smoothly and rarely breaks (only happens when I have the lead out too far and am pressing very firmly). I can't use typical (Bic, mostly) mechanical pencil lead without feeling like a quality writing tool snob! I purchased my first container of 0.4 lead in January of 2010, and still have 6 pieces left!