Quality material: The track of this imaging experimental equipment is crafted from quality aluminum alloy, ensuring durability and resistance to wear. Its sturdy construction prevents deformation, making it suitable for repeated long term useConcave convex mirror tools set: This set includes all the necessary equipment for imaging experiments, making it an ideal accessory for teaching or experiment toolsUser friendly design: Equipped with a clear ruler and stable track, this teaching instrument allows flexible adjustments to demonstrate various appearance. It is easy to assemble and use, enhancing learning experienceCompact size: Measuring 50 cmx5 cmx8 cm/19.69 inchx1.97 inchx3.15 inch, this optical experiment kit is compact and portable while being fully functional. It saves space and is nice for everyday use or in small experimental environmentsVersatile application: Designed with multifunctionality in mind, this physics experiment tool is nice for physics teaching purposes and can be used by teachers and students alike. It also makes a great gift choice due to its practical design Specification: Material:Aluminum Alloy Size Chart: Total Size: 50cmx5cmx8cm/19.69inchx1.97inchx3.15inch Package Includes: 1 Set ofImaging Experimental Equipment Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.