Pen-style envelope moistener features an adhesive for sealing envelopes anywhere. Fast-drying glue pen is perfect for paper products. Design includes a 10 ml. spill-proof plastic bottle and a patented spring-valve applicator that won't clog. Each handy pen secures more than 300 envelopes. Moistener pen is nontoxic, nonflammable and conforms to ASTM D-4236.