Built-in UV light: Each pen has a built-in UV light that can illuminate your markings, making them easier to view. Invisible ink: The pen tip is specially designed to write with invisible ink, providing kids with a fun and mysterious writing experience.
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10/5Pcs/Lot Gel Exam Pen Black Blue & Red Needle Tube Ink 0.5mm Writing Gel Ink Pens Office & School Supplies
Aliexpress UK
1 Ballpoint pen. Type: function pen. Due to the differences between the display and the different lights, the picture may not reflect the actual color of the item. Product details may vary slightly due to different production lots.
eBay
Black / Blue 10 Pieces Hongdian Black Fountain Pen Ink Cartridges 3.4mm Diameter for HongDian Ink Pen
Aliexpress UK
Built-in UV light: Each pen has a built-in UV light that can illuminate your markings, making them easier to view. Invisible ink: The pen tip is specially designed to write with invisible ink, providing kids with a fun and mysterious writing experience.
eBay
Jinhao Blue Black Screw Refill Ink 0.7mm Nib Rollerball Pen New School student Office stationery pens ink
Aliexpress UK
1 Ballpoint pen. Type: function pen. Due to the differences between the display and the different lights, the picture may not reflect the actual color of the item. Product details may vary slightly due to different production lots.
eBay
30ml British Original Diamine Color Dye Type Fountain Pen Ink， Dip Pen, Drawing Ink
Aliexpress UK
Batteries included and installed.they each had a pull tab to save battery life. Smooth and colorful disappearing inks on t-shirts, paper, skin and any surface! Permanent but washable! It can be used for studying, drawing, sketching, coloring, underlining and so on.
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3.4/2.6 Caliber ink sac for fountain Pen Replaceable Blue black ink sacs for pens office school supplies for majohn n1\m3\m6
Aliexpress UK
The 5 Top Secret UV Pen Invisible Ink Pens are a series of unique pens that use invisible ink, only visible under UV light. 3 pens have a black body.
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Precision Micro-Line Pens, Set of 9 Colors Brush Fineliner Ink Pens, Waterproof Archival Ink, Multiliner Sketching Anime Drawing
Aliexpress UK
1 Ballpoint pen. Type: function pen. Due to the differences between the display and the different lights, the picture may not reflect the actual color of the item. Product details may vary slightly due to different production lots.
eBay
2Pcs Fountain Pen Filler Ink Pen Syringe Absorbor Device Tool For Ink Cartridge Converter Office school supplies
Aliexpress UK
1 Ballpoint pen. Type: function pen. Due to the differences between the display and the different lights, the picture may not reflect the actual color of the item. Product details may vary slightly due to different production lots.
eBay
STONEGO Handcrafted Wood Fountain Pens, Vintage Fountain Pen, Medium Nib, Includes 4 Ink Cartridges and Ink Refill Converter
Aliexpress UK