Yellow Door Number Stamping StonesExplore a love for numbers with the Yellow Door Number Stamping Stones. Press, play and discover fun, hands on ways to explore numbers with this engaging set of number and operation symbols stamping stones. Designed to make early numeracy exciting, these stamps encourage little ones to learn through play, creativity and exploration. Chunky and tactile, each stone is perfectly sized for small hands to grip and press. Use them in playdough, clay, sand