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 Toy Material: Acrylic Features: Educational, Refractive, Multiple Shapes Specification: 5Pcs/Set Size Details: Triangle Lens Toy Size: 6cm x 3cm/2.36" x 1.18" (Approx.)Cylindrical Concave Lens: 6cm x 1.6cm/2.36" x 0.63" (Approx.)Cylindrical Convex Lens: 6cm x 1.6cm/2.36" x 0.63" (Approx.)Rectangular Lens: 6cm x 3cm/2.36" x 1.18" (Approx.)Semicircular Lens: 6cm x 3cm/2.36" x 1.18" (Approx.)Thickness: 1cm/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