S.P. Richards Company Envelope Moistener, Pencil Type, Sponge Tipped (SPR01482), 6 Packs Envelope moistener ensures a steady flow of water without leakage. Transparent pencil-like plastic tube reveals water supply. Sponge-tipped applicator makes it easy to apply just enough moisture. Envelope moistener holds 0.352 oz. (10c.c).