Made from durable polystyrene (with heavy walls).

This material is unaffected by humidity and is thoroughly insect proof. Each box is secured with a rust-resistant nickel-plated clasp and hinge pin. The cork lining prevents damage to the stored slides. To ensure proper slide identification, each slot is numbered to correspond to the slide inventory sheet on the inside cover of the box. To save space the boxes are stackable. Each box stores up to 100 3x1" or 25 x 75 mm microscope slides. available in 5 color coded boxes making the boxes easy to identify. Each box measures 222 x 172 x 35 mm (8.75 x 6.75 x 3.375").