Thank you for viewing. This is a Rainbow Prism. It's made of optical glass, not plastic, so it has a high light transmittance and excellent light refraction properties. Comes with a box case. Size: 30 x 30 x 30 x 100 mm Used only once after purchase. It has been stored at home since then. Although used only once, it is a used item. Please understand this before purchasing. Thank you.