Birth & up. Iridescent discs change color in the light. Children love observing their reflections. Mirrored multi-color discs with slightly flattened centers and graduated sizes provide a distorted reflection. Constructed of stainless steel, they're lightweight, smooth and durable. Improves fine motor skills, dexterity and problem solving as children manipulate these smooth discs. Can be used for stacking, sorting and sensory play. Sizes from 2" - 5.5" diameter.