Set of 6 clicker pens.
Black, blue, pink, purple, red and turquoise 

Retractable model with side clicking action!

Thermo sensitive gel ink that disappears with friction using the rubber tail tip on the pen with no residue and no tearing of paper.

No cap to remove to get to erasing tip!

Smooth writing gel ink

If pen is exposed to extreme temperatures (<-10C;>60C) , the ink will disappear.

These pens have been very popular in the sewing and quilting community.

As with any marking pen, test on a sample of your fabric.