Blue when wet and clear when dry; use 2 different ways.
For a permanent hold, apply glue to one paper surface and adhere it to another paper surface. For a repositional hold, apply it to a paper surface and allow it to dry clear before adhering it to the other paper.
Squeeze and roll.
This item is purchased and shipped in bulk. You will receive 12 loose pens. Also available as a single pen purchase. See item#MSB15C.