This set includes 7 reflective, discus-shaped pieces for multisensory and stacking activities. The stunning, iridescent surface provides a slightly distorted reflection which fascinates children and encourages descriptive language. The reflective surfaces change colors in the light as children move the discs. Sensory Reflective Buttons are smooth and lightweight with flattened midpoints so children can construct wobbly towers during imaginative play. Robustly constructed with stainless steel, the buttons are chemical-free, seam-free, non-porous and hygienic, which makes them ideal for all play environments. Use the reflective discs indoors or out, or to provide a focal point for displays. Size of largest button: 5.5"W. Size of smallest button: 1.9"W. Suitable for all ages.