Premiere brand Premium Glass Microscope Slides, 2 Boxes of 72 = 1 Gross of 144 Slides Total. Premiere brand slides are made of corrosion resistant glass with smoothly polished edges and slightly clipped corners. Precleaned and suitable for all medical applications at economical prices. 75x25mm (3"x1"), approximately 1mm thick. Made in accordance with international standard ISO 89037/1 and to the IVD (In Vitro Diagnostics Medical Devices Directive 98/79/EC).