Kids Physical Optical Experiment Tool - Concave lens, Convex Lens & Great experiment toy to help children learn the reflection and refraction of light , and cultivate kids interest in physics and science. Usedfor physical lab optical study and learning, also for school teachingtool about chromatic , reflection, refraction, etc. Material: ABS Plastic Color: As pictures shown Specification: Height: Approx. 13cm / 5.12 inch Lens Diameter: Approx. 5cm / 1.97inch Package Includes: 1 Set Physical Optical Experiment Tool : Choking Hazard - Small parts not for children under 3 years. Please be reminded that due to lighting effects and monitor& 39;s brightness/contrast settings etc., the color of the website& 39;s photo and the actual item could be slightly different. Also please allow a slight difference in size which may caused by manual measurement.