And stocking stuffers should ideally cost below $20, so at just $8 for a six-pack, this set definitely fits the bill. Invisible ink pens are just as cool now as they were when we were kids.

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

Invisible ink pens are an excellent way for grown-ups to discreetly mark items in their workplace and a great toy for kids who want to play games. Skip to content. KRON4.

Invisible ink pens are an excellent way for grown-ups to discreetly mark items in their workplace and a great toy for kids who want to play games. Skip to content. FOX31 Denver.

Invisible ink pens are an excellent way for grown-ups to discreetly mark items in their workplace and a great toy for kids who want to play games. Skip to content. FOX8 WGHP.

Invisible ink pens are an excellent way for grown-ups to discreetly mark items in their workplace and a great toy for kids who want to play games. Skip to content. WKRG News 5.

Invisible ink pens are an excellent way for grown-ups to discreetly mark items in their workplace and a great toy for kids who want to play games. Skip to content. KXAN Austin.

Invisible ink pens are an excellent way for grown-ups to discreetly mark items in their workplace and a great toy for kids who want to play games. Skip to content. WLNS 6 News.

Invisible ink pens are an excellent way for grown-ups to discreetly mark items in their workplace and a great toy for kids who want to play games. Skip to content. WFLA.

Invisible ink pens are an excellent way for grown-ups to discreetly mark items in their workplace and a great toy for kids who want to play games. Skip to content. KLFY.com.

Invisible ink pens are an excellent way for grown-ups to discreetly mark items in their workplace and a great toy for kids who want to play games. Skip to content. KELOLAND.com.