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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🖋️ Write with confidence, style, and security — because your ideas deserve the best.

SLEEK PROFESSIONAL - Minimalist white design complements any modern workspace aesthetic
BOLD PRECISE STROKES - 1.0mm broad tip delivers confident, standout writing every time
COMFORT MEETS CONTROL - Ergonomic rubber grip designed for extended writing sessions without fatigue
SECURE YOUR SIGNATURE - Uni Super Ink protects your documents from tampering and fraud
ENGINEERED FOR ENDURANCE - Tungsten carbide ball ensures smooth, long-lasting performance

The uni-ball Signo UM-153 gel rollerball pen features a 1.0mm broad stainless steel tip paired with a tungsten carbide ball for smooth, durable writing. Its Uni Super Ink technology safeguards your writing against fraud, making it ideal for professional use. With an ergonomic rubber grip and sleek white design, this pen combines comfort, reliability, and style in one essential office tool.

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Manufacturer	Mitsubishi Pencil
Brand	uni-ball
Model Number	64538
Product Dimensions	1.3 x 13.89 x 1.8 cm; 13.61 g
Colour	White
Closure	Click-Off Cap
Grip Type	Rubber
Material Type	Stainless Steel
Number of Items	12
Size	1 Count (Pack of 1)
Point Type	Broad
Line Size	1.0mm
Ink Colour	White
Tip Type	gel
Manufacturer Part Number	UM153.1
Item Weight	13.6 g

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

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