Is 1mm too thick a line to use in a exam?

I dont think so. I'm not entirely sure. I did some research about it for exams and read exam rules but it just mentions a black or blue pen. However, when I did my GCSE I remember somewhere mentioning the thick shouldn't be over 1mm. Just so you are aware, this pen has white colored ink. I'm jusy informing you so you dont accidentally purchase this having thought it was black. I do recommend this for black paper though because it is really vibrant.

How does this compare to the sakura gelly roll pens in white please anyone know?

The uni 153 as a slight edge over the Sakura. Both great products.

I need a white pen for my gcse photography book - which has black pages. does this pen smudge? does it last long?

The ink in these pens is a thicker consistency than a normal pen, it's more like a gel and so needs a bit of time to dry, (not too long!), which means they can smudge beforehand. They leave a raised texture on the page once dry. I cannot really vouch for how long they last, as I only use them in my artwork, rather than for prolonged written work, but I would guess they last less time than an ordinary Biro. They are lovely to use though, very smooth and produce a striking effect. Hope this helps.

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Uni-Ball 146801 - Signo UM-153 gel rollerbalpen, breed, 1,0 mm, wit, 1 stuk

Uni-Ball 146801 - Signo UM-153 gel rollerbalpen, breed, 1,0 mm, wit, 1 stuk

Product ID: 47869527

Details

Age range (description)
Adult
Brand
uni-ball
Colour
White
Ink colour
White
Material
Stainless
Model name
Uni-Ball -

⚙️Tungsten carbide ball for smooth flow

🖊️1.0mm broad stainless steel tip

🛡️Uni Super Ink fraud protection

Description

🖋️ Write Bold. Write Bright. Stand Out.

BOLD PRECISE LINES - 1.0mm broad tip delivers standout, consistent strokes for professional notes and creative projects.
UNMATCHED SMOOTHNESS - Tungsten carbide ball ensures effortless glide—write faster, neater, and with zero skips.
VIBRANT WHITE ON DARK - Opaque white gel ink pops on black paper—ideal for artists and trendsetters who dare to be different.
SECURE AUTHENTIC INK - Uni Super Ink guards your work against tampering and fading, perfect for important documents.
TRUSTED JAPANESE CRAFTSMANSHIP - From Mitsubishi Pencil’s legacy, a pen that blends heritage with cutting-edge writing tech.

The Uni-Ball 146801 Signo UM-153 is a premium white gel rollerball pen featuring a 1.0mm stainless steel tip and tungsten carbide ball for smooth, bold writing. Its Uni Super Ink technology offers fade-resistant, tamper-proof ink, making it perfect for professional use and creative expression on dark surfaces. Crafted in Japan by Mitsubishi Pencil, this pen combines durability, precision, and vibrant opacity in one sleek tool.

Specifications

ASIN	B00161UAJS
Age Range Description	Adult
Age range (description)	Adult
Animal Theme	No animal theme
Artistic Charcoal Form	Compressed Charcoal
Best Sellers Rank	19,584 in Stationery & Office Supplies ( See Top 100 in Stationery & Office Supplies ) 386 in Gel Ink Rollerball Pens
Body Shape	Round
Brand	uni-ball
Brand Name	uni-ball
Closure Type	Click-Off Cap
Colour	White
Country Of Origin	Japan
Customer Reviews	4.5 out of 5 stars 7,231 Reviews
Drill Point	Broad
Global Trade Identification Number	04902778588802, 30070530645386
Grip Type	Rubber
Included Components	Ink Refill, Click-Off Cap
Ink Base	Water
Ink Colour	White
Ink colour	White
Is the Product Left or Right Handed?	Right
Item Diameter	1 Centimetres
Item Dimensions	13 x 139 x 18 millimetres
Item Weight	10 Grams
Line Size	1_0_1_9mm
Manufacturer	Mitsubishi Pencil
Manufacturer Contact Information	Nuremberger Str. 2, 90546 stone
Material	Stainless Steel
Material Type	Stainless Steel
Model Name	Uni-Ball 146801 -
Model Number	64538
Recommended Uses For Product	Coloring, Drawing, Sketching, Writing
Special Features	Liquid Ink
Subject Character	No topic
Theme	Personalization
UPC	070530645385
Unit Count	1.0 count
Water Resistance Level	Not Water Resistant
Writing Instrument Form	Gel Pen
Writing Technique	gel pen
Writing instrument form	Gel Pen

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