Description The Uni Nano Dia Blended Hi-Quality refill leads are available in 4 stand sizes, i.e. 0.3mm, 0.5 mm, 0.7 mm and 0.9 mm, each of which are compatible with most of the standard mechanical pencils. The products are also available in different lead grade, such as B, 2B, 3B, H, 2H, 3H, 4H, HB and F.
