This 7-piece acrylic block set includes a rectangle (75 x 50mm), semi-circle (75mm diameter), three triangular blocks (60-60-60° with 58mm sides; 90-45-45° with 75mm hypotenuse; 90-60-30° with 75mm hypotenuse), bi-convex block (75mm long with 100mm radius curved faces), and bi-concave block (75mm long with 100mm radius curved faces). Each block is 15mm thick with all faces fully polished. The set is supplied in a wooden storage box. Suitable for physics classrooms studying optics, light refraction, spectrometry, and wavelength behavior, as well as photography lighting and distortion effects.