The rubber coating adds extra protection from accidental bumps and makes this microscope a durable tool for young explorers. Our product allows you to explore the fun of science. The material of this microscope is made of metal + plastic. Its dimensions are: 12.5cmx18.2cmx31cm/4.9inx7.2inx12.2in. Microscope monocular viewing head with mirror illumination. This biological microscope is designed to help beginners, , and explore the fantastic micro world of life sciences.