Detail:<br />Material: optical glass， not plastic<br />Color: Transparent<br />Quantity: 1 pc<br />Side length: 3 cm / 1.18"<br />Prism length: 15 cm / 5.9"<br />Package size: 18 x 5.8 x 4.7 cm / 7.08" x 2.28" x 1.85" (LxWxH)<br /><br />Triangular prisms are used to disperse light， that is to break light up into its spectral components(the colors of the rainbow)<br /><br />Package includes: <br />1 x Triangular prisms