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 4-1/2-inch long 2 way glue chisel tip pen. Photo safe and acid free. Conforms to ASTM D4236 standard. Xylene free water based glue. Tip size chisel ball point 1-mm line.