Features: Three Way Linear Light Source can be adjusted by using a screwdriver to adjust the direction of light. Optical Experiments: Refraction of light, convex lens refraction, lens refraction, prismatic refraction, etc. Lens Material: Made of good quality plastic material, safe and durable to use, and a practical teaching tool kits. Package Including: Biconvex Lens; Single Concave Lens; Glass Tile; Double Concave Lens; Triangular Prism... The Physics Optical Experiment set will give your child a deep understanding of physical optics and make learning easier! Specifications: Material: Plastic Color: As The Picture Shows Package Weight: approx.800g Size: approx.24x14cm/9.44x5.51in Package Includes: 1 x Physical Optics Set note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks!