Features: Perfect product for school optical experiment, and it is removable, and easy to assemble and install. Adopting large lengthened base, very clear scale, and with fine workmanship, quality assurances. Best for middle school student teacher physics learning, not suitable for children under 3 years old. Middle school physics laboratories equipment; You can do optical experiments by this set of optical equipment. The sets adopts quality material and has a stable structure, which makes your research and children more at ease. Specifications: Material: Plastic Color: As The Picture Shows Package Weight: approx.1000g Size: approx.32x20x8cm/12.59x7.87x3.15in Package Includes: 1 x Physical Optics Set note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks!