The Globe Scientific 513041 microscope slide mailer holds two slides, with or without cover glass. The mailer is made of polypropylene for durability and holds 25 x 75mm (1 x 3") microscope slides (sold separately) for transport. The case contains 1,000 mailers. An inner finger groove allows slide removal by touching only the edges, and a tight-fitting snap closure helps protect slides from shock and damage.Globe Scientific manufactures labware and supplies for use in clinical, research, education, veterinary, and industrial laboratories. The company, founded in 1983, is headquartered in Paramus, NJ.