I use the red, blue, and green leads from this line to make color coordinated
notes in school. These colored leads are best erasing leads I have found thus
far, but if left in direct sunlight will fade very fast. These seem about as
strong as the Pentel Ain leads available here, but those do not erase nearly as
My only complaint against the green is that I wish it wrote a little darker the
first time around and would gladly accept a softer/faster wearing lead for it.
The blue has stayed strong and written dark - no complaints whatsoever.
The red writes dark enough, but the leads that were in my pencil seemed to get
dry and brittle after a while (causing numerous pencil jams). However, the red
leads that were left at home in my desk drawer did not get dry and brittle so
this leads me to believe that the brittleness may be caused by heat from being
left in the car.
I am using this in my Pentel Twist-Erase III and it works pretty well. I
haven't had any lead breakage and the color is dark enough to write with but not
as dark as some people would probably prefer. The eraser on my pencil can erase
AIN 2B lead like it was never there but it does leave some marks with this lead
although it's not bad if you don't write too hard on the paper.
I have these leads in non-repro blue, blue, green and red with the lead the same
color as the pencil. For the price they are excellent leads, produce a
consistent line, and perform flawlessly. My only complaint is that it appears
that UNI is discontinuing the red, green, blue and non-repro blue leads. I can
get them in 0.7 mm leads but that is too wide a line.