Quick-drying water based adhesive works with most paper products. Spill-proof and patented spring-valve applicator won't clog. Small tip ensures close accuracy when sealing. Convenient size fits in briefcase, purse or desk drawer. Each pen secures over 300 envelopes. Certified non-toxic. Moistener Size: 10 mL; Color(s): Teal; Material(s): Plastic; Quantity: 2 per pack.