Let's Investigate: Nature Sensory StonesThese durable Nature Sensory Stones are perfect for outdoor and indoor play. Suitable for use with sand, soil, mud and water: you can dig them up, use as playdough stamps and as rubbing plates with crayons and pencils. Take the stones outside and see if you can find the item in real life, or play at 'planting' in the garden! This Nature set includes 12 stones: an acorn, dandelion seed head, feather, pine cone, snail shell, spider's web, sycamore leaf,