Can you buy refills for these, and if so where?

I do declare that you can buy them. I have seen them on Amazon (albeit a while back) but in my opinion you are better off buying another pen. The refills aew probably as expensive as the pens!

0.4 mm or 1mm as it says both in the write up ?

I've bought these (in blue) on more than one occasion and have never noticed that! My ones have 1.0 stamped on them which I take to mean 1mm. When I write with them it doesn't look particularly 'skinny' so my guess would be that it is actually 1mm and not 0.4mm. Sorry I can't be any more help.

Uni Ball Power Tank Black Ink Rt Ballpoint Pen Black | Desertcart British Virgin Islands

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Description

🖋️ Power through any condition with the pen that never quits!

DOUBLE THE POWER - Pack of 2 pens ensures you’re always ready to capture ideas on the go
PRECISION INK FLOW - Delivers a consistent, ultra-smooth 0.4mm line for sharp, professional notes
DURABILITY MEETS DESIGN - Robust tungsten carbide tip and solid body built to endure any environment
AMBIDEXTROUS COMFORT GRIP - Ergonomic rubber grip designed for all-day use by left and right-handed pros
UNSTOPPABLE OUTDOOR WRITING - Writes flawlessly even in freezing -20°C conditions and on wet surfaces

The Uni-Ball Power Tank Black Ink Ballpoint Pen is engineered for professionals who demand reliability outdoors and in extreme conditions. Featuring waterproof, fade-resistant ink that writes smoothly at any angle—even on wet paper and in temperatures as low as -20°C—this pack of two pens combines durability with precision. Its tungsten carbide tip and ergonomic rubber grip make it the ultimate tool for seamless writing in any environment.

Specifications

ASIN	B00C7RZ004
Age Range Description	Adult
Age range (description)	Adult
Best Sellers Rank	74,546 in Stationery & Office Supplies ( See Top 100 in Stationery & Office Supplies ) 558 in Ballpoint Pens
Body Shape	Cylindrical
Brand	uni-ball
Brand Name	uni-ball
Closure Type	Retractable
Colour	Black
Country Of Origin	Japan
Customer Reviews	4.5 out of 5 stars 287 Reviews
Drill Point	ball point
Global Trade Identification Number	05012788000344
Grip Type	Rubber
Included Components	2 pens
Ink Base	Water
Ink Colour	Black
Ink colour	Black
Is the Product Left or Right Handed?	Ambidextrous
Item Diameter	0.4 Millimetres
Line Size	0.4mm
Manufacturer	uni-ball
Material	Tungsten Carbide , Plastic (PC/PP)
Material Type	Tungsten Carbide, Plastic (PC/PP)
Model Name	Power Tank
Model Number	153486248
Recommended Uses For Product	Construction:, Industrial use, Outdoor Activities
Special Features	Durable, solid
Style	Retro
Unit Count	2.0 count
Water Resistance Level	Water Resistant
Writing Instrument Form	Ballpoint Pen
Writing Technique	Ball
Writing instrument form	Ballpoint Pen

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