Pens and Pencils | Reviews and Data

Uni-ball Signo UM-151 Gel Pen

Uni UM-151

The Uni-ball Signo DX UM-151 is capped (stick style) gel pen that is sold in a huge variety of colors. It’s sold as single pens, but also often sold in bundles that can have many pens and many colors. The key features of the pen are a dimpled rubber grip on a plastic body, and a steel tip at the front. The defining feature is the vibrant pigment-based ink that bonds permanently with paper, making the pen excellent for writing checks but also for painting and other artistic pursuits.

In the United States this pen is sold as the Uni-ball Gel Grip, in Japan it’s the Uni Signo DX, with the model number of UM-151.

Then pen is sold in at least 20 colors (depending on your region) as well as metallic colors, pastels, and others. It’s popularly seen in 0.5 mm and 0.7 mm sizes, but also sold in 0.28 mm and 0.38 mm.

Uni-ball Signo UM-151 Gel Pen Information

Street Price Check Price
Manufacturer Uni
Pen Type Rollerball / Gel
Barrel Color Clear
Barrel Material Plastic
Body Diameter (mm)10.3 mm
Grip Color Brown, Purple, Silver, Light Brown, Light Blue, Light Pink, Gold, Bronze, Red, Orange, Blue, Pink, White, Yellow, Light Green, Lime Green, Baby Pink, Metallic Red, Pure Pink, Sky Blue, Pastel Yellow, Pink, Metallic Silver, Metallic Blue, Light Blue, Light Green, Silver, Gold, White, Pink, Gray, Red, Yellow, Bronze, Black, Dark Blue, Blue, Purple, Orange, Light Brown, Green, Brown, Green, Purple, Gold, Orange, Bronze, Yellow, Light Green
Grip Material Rubber
Grip Diameter (mm)10.3 mm
Country of Origin Japan
MSRP $1.50
Still Sold Yes
Similar To
Capped? Retractable?Capped - Snap On
Length Capped / Retracted (cm)13.8 cm
Length Posted (cm)15.3 cm
Length Uncapped (cm)13.1 cm
Weight (g)11 grams
Ink Color ShippedPink, Metallic Pink, Silver, Light Brown (Khaki), Purple, Gold (Metallic Gold), Baby Pink, Golden Yellow, Sky Blue, Red, Brown Black, White, Violet, Green (Metallic Green), Light Green (Apple Green), Bronze (Metallic Bronze), Light Brown (Beige), Pure Pink, Orange, Light Blue, Yellow, Blue (Metallic Blue), Purple (Metallic Violet), Red (Metallic Red), Green (Metallic Green), Gray (Grey), Brown Black, Turquoise (Blue Green), Purple (Lilac), Gray (Dark Grey), Green, Emerald Green, Pink (Pastel Red), Blue Black, Dark Blue (Prussian Blue), Black, Orange (Pastel Orange), Light Green (Pastel Green), Red (Metallic Red), Bronze (Metallic Bronze), Mandarin Orange, Pink, Light Blue (Pastel Blue), Blue, Gold (Metallic Gold), Purple (Pastel Violet), Yellow (Pastel Yellow), Brown, Violet, Purple (Metallic Violet), White, Pink (Pastel Pink), Red, Blue (Metallic Blue), Lime Green, Light Brown (Khaki), Pink (Metallic Pink), Silver (Metallic Silver), Green, Purple (Metallic Violet), Emerald Green, Gold (Metallic Gold), Lime Green, Bronze (Metallic Bronze), Golden Yellow, Orange
Writing Sizes0.28 mm, 0.38 mm, 0.5 mm, 0.7 mm