This is a set of optical lens, which are made of acrylic material, durable for use. These 6pcs different optical lens will meet your different needs. Good for demonstrating optical principles and effects for students, learning about the properties of light. Can be helpful for students to learn physics formula and the principle of light refraction. Features -Color: Transparent. -Material: Acrylic. - Size: 6.00X3.00X1.00cm/2.36X1.18X0.39in - Made of acrylic material, durable for use. - Can be helpful for students to learn physics formula and the principle of light refraction. - Can be regarded as a great gift to children who are going to learn the principle of light. - Intuitive and specific, it is conducted to help students understand and learn. - Good for demonstrating optical principles and effects for students, learning about the properties of light. Package list: 1 x Set 6Pcs Optical Lens