Optical grating painting animation is an unique way of animation, through this student can understand the principle of raster. The science plaything is not only educational, but also has entertainment value, allowing students to learn knowledge in the production process and have fun. Features -Color:Assorted Color -Material:Paper -Size:20.00X14.00X0.01cm/7.86X5.50X0.00in -Optical grating animation is a simple and unique way of animation, through this student can understand the principle of the optical grating. -This creative optical grating toy is made of good paper materials, , safe and durable. -A wonderful educational toy to exercise ability, improve kids' creativity, and improve imagination. -This small science production can not only cultivate children's learning ability, hands-on ability and ability, but also increase children's interest in the endless exploration of the scientific world. - Made of natural paper material, this science toy is safe for your babies, you can but it with ease. Package list: 1 x optical grating plate 6 x backdrop painting