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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.
5 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.
4 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!!!
2 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.
The Blacked IPs
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.
I bought these just to...
April 15, 2014
Verified Purchase
I bought these just to try something different for drawing and sketching. I'm very impressed by the hardness of these leads and the very soft feeling they have when they glide on most papers. Granted they aren't 2B darkness, not in the sense of say artistic pencils. It looks more like an HB pencil in darkness but it writes/draws morel like a 2B - hard to explain.

The case is nice to. I like how the back had a picture and explanation stating how you can open it just a little for one lead or open it up more for multiple leads. It stays closed very nicely so I don't have to worry about the cap coming off while traveling with them in my bag.
I got this lead because...
November 1, 2012
Verified Purchase
I got this lead because I wanted something dark for legibility. This lead writes a smooth dark line at the expense of durability. It is extremely prone to breakage (at least in my uniball multipen). I find myself switching to wooden pencils because of this annoyance.
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