This glue can be used two ways. Use it when it"s blue and wet for a permanent bond or let it dry clear for a few moments to get a temporary bond. This package contains one 2 Way Glue Fine (2mm) Point Pen. Photo safe and acid free. Conforms to ASTM D4236 standard. Main components, acrylic emulsion and water. Tip size fine ball point 2-mm line.