Size 0.8*1 inch (2*2.5cm),nw 19g,please pay attention to the size, it's small.Easy to carry, you can carry it in your pocket or backpack. Even on the desktop, it doesn't take up much space. | RGB optical prism cube is a cube made of colored glass panels,which is not easy to fade and scratch resistant, thus ensuring maximum use in the next few years.It can manipulate light through light refraction to form a kaleidoscope-like pattern. With its exquisite and unique design, even if you are in the same place, you can enjoy various colors from different angles; a truly great visual experience! | If the sun isn't shining, you can use a flashlight. Just position your prism so that the light shines through it, and there should be rainbows dancing on the opposite wall! | The exquisite decoration on any surface or table of multi-dimensional cubes can exude a pleasant optical entertainment effect, everyone will enjoy and be fascinated. | Glass cube prism ideal for teaching of optics, science experiments, and for photography.Suitable for children to explore colorful spectrum or to add effects to your photos.Also it is packed in a nice gift box,perfect gift idea for children,mother,teacher,friend etc.