This 3D wall sculpture is made of environmentally friendly non-toxic resin materials and hand-crafted by top professionals, striving for perfection in every detail. Every astronaut's surface has stood the test of time and is extremely durable. * Since the size of each sculpture is different, please refer to the values in the picture for the exact size. Each astronaut wall decoration comes with a corresponding number of screws, the 3D wall decoration has a small hole design on the back, all you need to do is drill the screws into the wall and hang the astronaut on the screws! Easy to operate, very strong and will not fall off! If you still have installation problems, check out the video. Please carefully check that the screws and accessories are complete, and be careful not to accidentally throw the accessories away with the packaging.