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I spy invisible ink pens that belong in the kids' stockings — snag a pack for $8

They have built-in UV lights and are suitable for children ages 3 and up, but you'll have fun using them too!

Need some gifts for your kids, grandkids, nieces and nephews? More specifically, gifts they won't toss aside as soon as they open them? We've got the goods: Maleden Invisible Ink Pens. These top-sellers are super popular among Yahoo readers this year, and for good reason. Creating cryptic messages is loads of fun for both kids and the — ahem — young at heart, they don't make a mess and they're affordable to boot. Plus, revealing what you've jotted down using the cap's built-in UV light is ridiculously satisfying. Get a pack (or five!) while they're $8 at Amazon.

Oh, and for even more gift ideas for the whole family, be sure to check out our roundup of this season's best stocking stuffers. (These pens made the list!)

These popular pens are designed for children 3 and up, but don't be surprised if you find yourself having fun with them, too!

$8 at Amazon

Trending gifts for kids seem to change by the minute, but invisible ink? That magic will stand the test of time. What's great about these invisible ink pens is they come with batteries, so the little ones can play with them right out of the package. Plus, they come in different colors, so each tot can have their own should you decide to divvy them up. (Just note, the ink color is the same across the board.) Best of all, they allow kids to use their imaginations, keeping them entertained free of any screen time.

According to the brand, the ink can be used on practically any surface, from paper to clothing and beyond. While it is permanent, it's also washable. We'll take invisible ink scribbles on our walls over purple Sharpie any day! And stocking stuffers should ideally cost below $20, so at just $8 for a six-pack, this set definitely fits the bill.

the set of colorful invisible ink pens / someone using the pen's UV light to reveal a message
Invisible ink pens are just as cool now as they were when we were kids. (Amazon)

With over 6,300 five-star ratings from Amazon customers, the Maleden Invisible Ink Pens are a huge hit among gift givers and recipients alike. "Fun, fun and more fun for kids!" exclaimed one excited shopper. "I used these pens on Christmas gift tags. [My] grandkids needed the secret light to see the names on [the] tags. They had a blast!"

And they're not just for kids. This writer revealed: "I play Dungeons and Dragons and wanted to make a book with secrets in it. These work perfectly and are so convenient to have a light on each. Players loved it." They added: "I'm an adult, I promise."

Important to note that these pens work best as described and not as a Bic replacement. "I bought these to mark the floor as I moved stereo speakers to optimize the sound," said one. "Unfortunately the ink does not transfer to my hardwood floor. The pens are now used by my grandkids to send secret messages on paper, which works fine."

"The pen set has brought a whole new level of fun and excitement to our family's games and activities," raved a final fan. "My kids and I have been enjoying endless hours of spy-themed adventures and mystery-solving missions. ... It's been a fantastic way to keep them engaged and entertained, especially during playdates and rainy days indoors" Their one note? "The invisible ink works best on plain white paper or light-colored surfaces. When used on dark or heavily textured paper, the writing may not be as clear or visible under the UV light."

At this price, snag a few backup sets to have on hand when the kids inevitably lose theirs.

$8 at Amazon

If you have Amazon Prime, you’ll get free shipping, of course. Not yet a member? No problem. You can sign up for your free 30-day trial here. (And by the way, those without Prime still get free shipping on orders of $35 or more.)

The reviews quoted above reflect the most recent versions at the time of publication.