The Sensory Reflective Silver Buttons are robustly constructed from stainless steel and have a pleasingly rounded discus shape with smooth seamless edges. This makes them perfect for adding to treasure baskets as a sensory resource. Also the polished mirror surface provides a slightly curved and distorted reflection which is fascinating for children to observe.Great for developing mathematical language - larger smaller taller steeperAllows tactile and sensory explorationSizes: 50mm 65mm 80mm 95mm 110mm 125mm and 140mm dia. Pack of 7. Suitable from birth.