The ZIG MEMORY SYSTEM 2 WAY GLUE Pen with a Chisel Tip is formulated to create either a temporary or a permanent bond without the mess. It is permanent when wet, but if you let it dry, it becomes tacky, making it great for re-positioning. The glue is BLUE when it is wet, indicating a permanent bond. In a few moments, it turns CLEAR after drying, signifying a temporary bond. TIP SIZE: 4mm. INK TYPE: Main components: Acrylic emulsion, Water. Photo-safe, Acid Free, Xylene Free. Model Number: KUMSB-15P, MPN: MSB-15P. Made in the UK.