3pcs New 2 in 1 UV Light Combo Creative Stationery Invisible Ink Pen tattoo pen
Length: 13cm
Feature: This pen is very interesting.
After you've written, the handwriting is transparent.
If you use LED light on the cap to shine on it, you will see the words.
LED light battery: 3 x AGG button battery ( included )
3 x Invisible Ink Pen