package included:<br />1 x triple prism + 1 decent gift box<br /><br />5cm 10cm 15cm 20cm <br />triple triangular prism physics teaching light spectrum<br /> <br />feature:<br />1.precise cuttings， offer good reflections and color seperation<br />2. and durable . <br /> <br />specification:<br />material: k9 optical glass<br />prism length: 5cm 10cm 15cm 20cm<br />product size: 30*30*30mm