Features: Nine planets DIY setit needs to be assembled by yourself. Learning in play, exploring the planets of the solar system, improve the understanding of the universe. The rotating rod of each planet will rotate around the center of the sun to realistically simulate the trajectory of the planets in the solar system. Learn astronomical knowledge of planetary ordering and understand the mysterious planets. Best STEM educational gift. Simple assembly to cultivate hands-on ability. Made of high quality material, rounded edge, safe to use. Specifications: Size: 21 x 18cm Age: 8Y+ Packing Included:1 * Solar System Planetary Model DIY Kit Note: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 2. Please allow 1-3cm measuring deviation due to manual measurement. ( 1 inch = 2.54 cm )