Cast from a durable mix including real stone these large tactile stones measure 3 inches across and are designed to enable children to have sensory experiences by experimenting with raised and indented shapes and patterns. The set of 8 stones include: 4 raised/bumpy designs circles dots wavy lines and a grid; and 4 indented/hollow designs circles lines zigzags and a spiral. The set comes complete with a teacher s guide with ideas for sensory play messy play printing and mark making. Length: 6.5. Width: 4. Height: 4