Uni-ball Signo RT UM-138 Gel Ink Pen - 0.38 mm - Black

$1.65
In stock and ships within 1 business day.
4.6 (34 reviews)
DescriptionSpecifications
Uni Signo RT gel ink pens contain water-based pigment gel ink and feature a retractable 0.38 mm gel ink roller ball pen, rubber grip, and a steel point for strength.

Super practical and affordable, the Signo RT pens have been a long time tried and true favorite of JetPals.

Model NumberUNI UMN103.24
Weight0.4 ounces
ManufacturerUni
Body Color Black
Body Material Plastic
Clip Material Plastic
Clippable Yes
Color Set No
Diameter - Grip 9.6 mm
Diameter - Max 10.6 mm
Grip Color Black
Grip Material Rubber
Ink Characteristics Waterproof
Ink Refillable Yes
Length - Extended 13.8 cm
Length - Retracted 13.9 cm
Mechanism Retractable
Pre-Installed Ink Color Black
Tip Length 4.4 mm
Tip Material Metal
Tip Size 0.38 mm
Tip Type Conical

Frequently Bought Together

Uni-ball Signo RT UM-138 Gel Ink Pen - 0.38 mm - Black - UNI UMN103.24
+
Uni UMR-83 Gel Ink Pen Refill - 0.38 mm - Black - UNI UMR83.24
Total Price: $3.00
This item: Uni-ball Signo RT UM-138 Gel Ink Pen - 0.38 mm - Black - $1.65

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Customer Reviews

While the 0.38mm tip...
June 8, 2011
Verified Purchase
While the 0.38mm tip writes fine lines, I am rather disappointed in the ink reservoir. If you pay close attention, the inner diameter on the refill is much smaller than most normal refillable pens which explains why these pens have such a short lifespan. The inner diameter on this refill is 2mm (approximately 3/32”) whereas other pens, like the Zebra Sarasa or the Uni-ball Signo 0.5mm, have a much wider inner diameter. These pens have a 5mm (approximately 5/32”) inner diameter, resulting in 2.5 times more ink than the Signo 0.38mm RT. It’s a great price, especially for those who love super fine tips. Me? I’ll take the extra ink with a 0.5mm tip.
5 people found this helpful
To the guy who is complaining...
January 18, 2012
To the guy who is complaining about the reservoir size. It isn't that the .38 size has a smaller reservoir in particular, it's that the retractable signo's as a model have a smaller reservoir. Any size of signo DX models will have the same size reservoir. If you want .38 and still want a big reservoir go look at the .38 signo DXs. They also come in .28 and .5 btw. Anyways, the pen itself has been good to me as all the models of signo I've tried have been. Other than that sometimes not having to worry about a cap can be a good thing. Also, the grip is farther down the pen, which is better for me because I hold pens closer to the tip, which with the Signo DX model is pretty far up so I end up holding past the grip anyways.
4 people found this helpful
ken.y.hua
The greatest pen on this...
February 9, 2015
Verified Purchase
The greatest pen on this Website. Buy it immediately.

1 person found this helpful
BruhBruhsterson
I love these pens. They...
November 24, 2014
Verified Purchase
I love these pens. They are by far the best pens I have ever written with. I have ordered 6 refills and I bought the pack of assorted colors because they are great. I use the different colors for taking notes at school. I like how pointy and fine they are. I have gotten other brands of 0.38 and 0.4, but this is by far my favorite.
1 person found this helpful
lil_monkey0319
I think this is the only...
January 2, 2015
Verified Purchase
I think this is the only pen I have used up in one semester. I absolutely loved this pen and I need to get a refill for the one I bought. It works super well for notes and homework and essays.
elistastreet
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