These are 72pc blank microscope slides with ground edges. The dimensions of the slides are 1" x 3" (24.5 x 76.2mm). They are made of clear glass and are pre-cleaned. They are brand new in factory-sealed box. Features & Specifications: Blank microscope slides Dimensions: 1" x 3" (25 x 75mm) Quantity: 72Material: clear glass Status: pre-cleaned