Heathrow Scientific HD15983G Polypropylene End Opening Slide Mailer, Assorted Colors, 5 Place, 43mm Length x 24mm Width x 88mm Height (Pack of 25) Internally slotted vial holds microscope slides securely apart for mailing Holds five, 25 x 75mm (1 x 3") microscope slides (sold separately) Tight-fitting snap closure helps protect slides from shock and damage Polypropylene construction for durability, natural color Red, yellow, blue, purple, and orange assorted colors