Cast from a unique mix including real stone, each durable stone measures 40-45mm and has a colourful bug character engraved on one side.Each set includes 20 stones, with five bug body shapes – circle, square, rectangle, triangle and hexagon, in four colours – red, blue, yellow and green.A leaflet with additional activities is also included with ideas for introducing the stones to the setting and games exploring sorting, counting and pattern skills.