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I'm a fan of Pentel's...
April 9, 2011
Verified Purchase
I'm a fan of Pentel's Ain Stein lead. However, I was using the 2B Stein lead in my Lamy 2000 and it was breaking more then I could tolerate. So, I switched to the Uni Nano Dia and, voila, breakage dropped significantly. The Nano Dia seems as dark as the Stein, but perhaps a previous reviewer is right that this Nano Dia is a little harder.

In any case, highly recommended.
6 people found this helpful
the lead is indeed durable....
April 4, 2009
Verified Purchase
the lead is indeed durable. writes well. smooth, but as you would suspect, because of their construction, the grade of the lead itself seems to be a bit harder than whats indicated on the label.
that said, its a great lead, doesnt smudge too much and the lines are dark and crisp. just something to keep in mind when making your purchase, if you are use to a softer darker 2b, you may want to try the 3b instead.
5 people found this helpful
Before, my main lead...
September 2, 2012
Before, my main lead was the orange AIN lead from Pentel. I thought previously that that lead was perfect as it was dark and strong. However, I was not completely satisfied with the lead and it was not smooth enough for me. So, I tried this lead and it was PERFECT. Now, this lead goes in all my pencils and it is a joy to use because it is so smooth, dark, and especially STRONG!!!
3 people found this helpful
2B is the best for writing....
March 14, 2011
Verified Purchase
2B is the best for writing. I love this Uni lead. It dark and strong. It as good as the pentel AIN 2B.
2 people found this helpful
I didn't want to give...
December 21, 2015
Verified Purchase
I didn't want to give in to the hype so instead of buying 2 of these I bought 1 of NanoDia and 1 Pentel Ain Stein. Now I regret the Ain Stein leads.

It REALLY doesn't break.
??unconfirmed?? Low-Wear, have no idea if it lasts longer
Smooth writting

Too expensive
Leaves more smudges than Pentel Ain Stein in writing and erasing

The test:
Wrote a total of 9 pages using a Platinum Zero Shin (MZ-500A) 0.5mm pencil and 12 pages with Pentel Ain Stein. On each page I made a mark each time lead broke and which lead brand I was using. In 9 pages the NanoDia did NOT break. In 12 pages the Pentel Ain Stein broke 9 times. Clearly killing both Platinum's claim of its double-chuck mechanism reducing lead breakage and Pentel Ain Stein's claim to be their strongest and least prone to breakage lead. With 0 breaks and smooth writing the NanoDia take their place as my favorite lead replacing the Staedtler Mars Micro Carbon I used to enjoy.
1 person found this helpful
The Blacked IPs
great stuff. doesn't...
May 9, 2016
Verified Purchase
great stuff. doesn't break. real dark. best of both
I have a Rotring 800...
May 8, 2016
I have a Rotring 800 which has a nasty tendency to break soft leads every time the lead is advanced. Until I tried this NanoDia lead I couldn't use anything under grade F with the pencil (I had been using Ain Stein leads). Now I've been using this 2B Uni NanoDia for months without the mechanism breaking a lead. Couldn't be more pleased.
Best lead for uni...
December 1, 2015
Verified Purchase
Best lead for uni
Great lead and great...
March 12, 2015
Verified Purchase
Great lead and great dispenser! If you're looking for a darker line the Uni NanoDia Low-Wear in 2B and 3B is a great choice!
Fantastic refill. ...
November 6, 2014
Verified Purchase
Fantastic refill.
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