It is a glue stick made in a square shape so that it can be applied firmly to the edges of the paper.The main body is also a quadrangle instead of the conventional cylinder. which makes it harder to roll off the desk and makes it easier to grip the knob that sends out the glue.
The blue color makes it easier to see the glued area and disappears when the glue dries. This ensures even and clean gluing. preventing missing out certain areas or overcoating.