These durable prisms are perfect for science exploration and creating rainbows in your classroom. Refract light with these triangular prisms and make your classroom's science lessons bright! Perfect for use in science centers and group activities. Make their brains and imaginations grow with even more smart classroom supplies and science activities on our site. Acrylic. (6 pcs. per set) 4 3/4" x 3/4" x 3/4"