This plastic single slide box is excellent for mailing one 3" x 1" slide. Made of polyethylene, this mailer is economical, reusable and has a sturdy, resealable snap top clasp that ensures secure closure. TOP is clearly labeled, and slide labeling is visible through the plastic cover. This plastic container measures 3.25 x 1.63 x .25 inches (82.6 x 41.4 x 6.4 mm) It is ideal for shipping specimens or prepared slides and can also be used for storage. Pack of 10 plastic single slide boxes.