Optical glass lens, laboratory optical bench accessoryScience experiment - exploring optical property, Early physics science educational toy for kids children studentStudent pupil teaching Aidsthe fun of the lenses learning science knowledgekid science development toys, a series of physical science boarden kids and children , stimulating their curiosityMaterial: Optical Glass, Plastic FrameColorAs picture showSize Chart:Convex Lens Diameter: 30mmFocal Length: 50mmHandle length : 1 2.5cm/ 4.92 inchPackage Includes:1 piece Optical Glasses Len Toy(2 Pack)Note:Please allow 1-3mm error due to manual measurement, make sure that you do not mind before you bid.Due to the different monitor and light effect, the actual color may be slightly different from the picture color. Our products are made with the splendid quality materials and are designed to provide you with the best possible user experience.