The Sakura Quickie Glue pen is a ball-point glue pen (.7mm). The Quickie Glue Pen lays down a thin, smooth line on glue. No shaking or squeezing required. The nib is spring activated so that it allows you to leave th cap off longer without drying out. A permanent or temporary bond is possible. when the glue turns blue it indicates that it has become permanent. As long as the glue is still clear, it is removable.