With the teaching instrument of F light source, your children would learn some knowledge about optics, which is helpful for their IQ training. If you want to stimulate your children's thirst for knowledge and exercise their thinking and operational ability, you could send the educational toy to them as a gift. Made of plastic material, it is durable and wear-resistant. The length of the case is 10cm, the width is 6cm, and the thickness is 1.6cm. The length of the pole is 6.3cm, and the diameter is 0.4cm. It is perfect for kids and teens. Item Name: Optics Experiment Set Material: Plastic Features: Educational, Optical Teaching, IQ Training Size Details: Light Source Case: 10cm x 6cm x 1.6cm/3.94" x 2.36" x 0.63" (Approx.) Metal Pole: 6.3cm x 0.4cm/2.48" x 0.16" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 2 x Optics Experiment Set