Features: Made of high quality all-steel material, it is durable and hard to wear.OOTDTY  The magnification is adjustable and the image is clear, making it easy to observe the texture and structure of tiny things.There are six objective lenses available, 4X, 10X, 20X, 40X, 60X, 100X.Offers high quality observation without additional chromatic aberration, make image more clear.This product is dedicated to a variety of biological microscopes, using a standard C interfaces.The microscope objective lens is built with tough, lab quality materials designed to stand up to everyday use. Each objective lens goes through a rigorous inspection before shipment to ensure you receive the highest quality item that you ordered.Specification: Material:MetalStyle: 4X objective lensStyle: 10X objective lensStyle: 20X objective lensStyle: 40X objective lensStyle: 60X objective lensStyle: 100X objective lensPackage Includes: 1x Biological Microscopes Lensnote: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.Thanks for your understandings.