Microscope slides made of clear glass with ground edges for added safety. One side has a frosted area for marking. The size of each glass slide is 1 x 3 inches (25.4 x 76.2 millimeters) and the thickness is 1.2 mm. Comes in packs of 50. Slide glasses are separated by dividers made of thin paper. Each box is in a separate vacuum sealed bag. Made by SAIL BRAND, ISO9002 certified. Due to the free shipping service in this website we require a minimum order of 10 packs. If you need less than 10 packs you may order them at MiniScience.com online store.