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 5-1/2 inch long 2 Way Glue Squeeze & Roll Pen with a fine ball point tip. Acid free and photo safe. Water based glue, xylene free. Conforms to ASTM D 4236. Imported.