Double Microscope Slide: You will receive 20pcs double concave slides,the size of each slide is 25mm wide,76.5mm long,1mm thick,enough quantity to meet your daily needs.Safe Design:Microscope slides have no sharp edges, they are neat to help protect the skin from injury and children can use them safely.Paper Insterted: In order to easy to use,we place paper between each microscope slide to prevent scratching the slide.Good Material: The slides are made up of high quality optical glassit adopts special glass treatment technology for high transparency.Wide Usage:Suitable for all optical microscopes to make biological microscope specimens, including plants, insects and animal tissues for biological education.