






🕵️♀️ Unlock the magic of hidden messages—because ordinary writing is so last season!
The KERRT Invisible Ink Pen set features four multicolor pens with fine 0.3mm tips that write secret messages only visible under the built-in UV light. Safe, non-toxic ink works on multiple surfaces including skin and fabric, making it perfect for kids aged 8-12, party favors, classroom gifts, and creative play. Durable and quick-drying, these spy pens turn everyday writing into a thrilling secret agent experience.



| ASIN | B01N6N4JJR |
| Additional Features | Invisible Ink |
| Age Range (Description) | Kid |
| Age Range Description | Kid |
| Best Sellers Rank | #19,867 in Toys & Games ( See Top 100 in Toys & Games ) #14 in Toy Electronic Spy Gear |
| Body Shape | Round |
| Brand | KERRT |
| Brand Name | KERRT |
| Closure Type | snap |
| Color | Multicolor |
| Customer Reviews | 4.5 out of 5 stars 2,729 Reviews |
| Drill Point | Fine |
| Global Trade Identification Number | 07062581954595 |
| Grip Type | Smooth |
| Hand Orientation | Ambidextrous |
| Ink Base | Water |
| Ink Color | Black |
| Item Dimensions | 4.02 x 2.01 x 0.59 inches |
| Line Size | 0.3mm |
| Manufacturer | KERRT |
| Material | Plastic |
| Material Type | Plastic |
| Model Number | CYJ10 |
| Recommended Uses For Product | Spy |
| Style | fun |
| Subject Character | Secret Agent - Multicolor |
| Theme | Spy |
| Unit Count | 4.0 Count |
| Warranty Description | no |
| Water Resistance Level | Not Water Resistant |
| Writing Instrument Form | Marker Pen |
C**N
Fun!
Worked well! Fun for me and the kids!
H**Y
Excellent gift for kids
Got as a Christmas gift for my son because he’s been telling me he wants an invisible ink pen and we’ve had so much fun ever since Christmas! We even write on our hand little messages to each other and then use the glowing part to reveal the message. He has shown other children and they’re impressed by these pens as well. Parents are asking me where I got them. They’re good quality, very durable, great value for the money since you get four. They are easy to use to use and they do dry quickly.
A**R
Nice prank
Good item
Z**A
Dries up very quickly
These pens are cute and fun to use; my kid sibling loved it. However, it dries out very, very fast. Also, we'd just been using two of these pens, and left the other two unopened for later (there are four pens in one package), but when we went to use the unopened pens a few months later, it did not seem to be working. The lights worked but the ink did not show up under the light. It's a cool product but for temporary use.
C**H
Big hit with kids—and a fun throwback for adults too
I bought a bunch of these to give to a group of kids, and they were a total hit. The invisible ink and UV light bring back memories of old decoder pens—such a fun, clever concept. They’re easy to use, work well, and make a great little gift or classroom surprise.
D**S
Worth it - kids love them
Great value and color variety. The kids had so much fun using these pens. And they actually work great. Good buy
P**D
Seemed fun but kids didn’t use
I am not sure if it was the product or that my grandkids just were not interested, but I got these for them for stocking stuffers and they pretty much just put them aside. Maybe it was because they were overwhelmed with other more impressive gifts. But I still have not seen them use them.
L**N
Portable black light messages
My son asked for these pens after seeing them at a book fair. He took them the same day they arrived to a football game. It was a little cold outside but the pens wrote smooth for the entire game. No one had any idea was he was writing down until he used the black light that's attached to the cap of the pen. He loves that he can write secret messages and I love that he's practicing his writing skills so it's a win / win. The four pens glow in the same color so the pen color is not an indication of ink glow color. All the inks are clear and you need the Black light that's attached to the cap of wach pen to see the message. This was the best deal I came across for this type of pen. My toddler also lost the cap after stealing it from his brother's room and after 2 hours without a cap it still writes.
Trustpilot
1 day ago
2 months ago