Sure Drop button enables careful control of the glue to ensure accuracy, safety and prevent wastage. Built-in Sealant Pin keeps glue fresh and maintains a clear channel to prevent the nozzle and cap from becoming stuck or blocked. Bonds instantly to virtually any surface. After use rotate the sealant pin and tap the Rig Glue Pen a few times to clear the nozzle and keep it free of glue. Contains 2ml Cyanoacrylate (Super Glue) per pen.