Description:It is an educational lens toy which is available for exploring the optical effect and teaching students the optical knowledge, and it is with different shapes and proper thickness.The lens toy with reflective function and refractive effect is available for learning the light refraction principle, and it is funny for kids to play and learn at the same time.The toy is made of acrylic material.There are different sizes of different shapes lens.It is suitable for education, kids, experiment, etc.Item Name: Lens ToyMaterial: AcrylicFeatures: Educational, Refractive, Multiple ShapesSpecification: 5Pcs or SetSize Details: Triangle Lens Toy Size: 6cm x 3cm or 2.36" x 1.18" (Approx.)Cylindrical Concave Lens: 6cm x 1.6cm or 2.36" x 0.63" (Approx.)Cylindrical Convex Lens: 6cm x 1.6cm or 2.36" x 0.63" (Approx.)Rectangular Lens: 6cm x 3cm or 2.36" x 1.18" (Approx.)Semicircular Lens: 6cm x 3cm or 2.36" x 1.18" (Approx.)Thickness: 1cm or 0.39" (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:1 x Triangle Lens Toy1 x Cylindrical Concave Lens1 x Cylindrical Convex Lens1 x Rectangular Lens1 x Semicircular Lens Note: 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.