ROKR Starry Night is a mechanical music box combined with solar system model. It needs self-assembly and require no glue at all. Once completed, the sun and planets revolve when music is playing.<br> <b>SPECIFICATION:</b><br> Tune: "Memory" Pieces: 101 pcs<br> Assembled Size: 5.3(L)x5.3(W)x6.1(H) inches<br> Estimate Time: 2.5 h<br> Material: Wood<br> <b>NOTE:</b><br> 1.The 3D puzzle kit need to DIY, waxing, polishing, assembling by yourself. The necessary tools are included with a clear English manual.<br> 2.Please wax enough as instructed to keep the gears rotate smoothly. Some parts may be fragile and need special attention when assembling.<br> 3. If you have any problem during assembly, such as parts missing or broken, we will provide you with replacement unconditionally.