A quick dip of a fingertip in a sponge moistener makes it easier to quickly flip through envelopes papers and more. • Size: 1 1/2 H x 3 Dia. • From stamps to labels the moisteners are designed to fulfill all of your moistening needs. • Features a super absorbent polyurethane sponge that is designed to spread moisture evenly without over wetting. • Perfect for spot-wetting envelopes stamps and more. • Cup moistener includes polyurethane sponge. • Sponge size: 3 Diameter. • Sold as 1 Each.