Classic stacking cups are one of the simplest and best toys for babies and toddlers. Scoop and pour water, build towers by turning upside down, or just sort sizes to nest. Each cup is numbered on the bottom from 1 to 6 to provide an introduction to numbers and addition. Fill cups 1 and 2, for example, and it will equal the volume of cup 3. Made from 100% recycled plastic milk containers that save energy and reduce greenhouse gas emissions. No BPA, PVC, phthalates, or external coatings. Meets FDA food contact standards. Dishwasher safe. Colors may vary. Cups range from 1-1/2" to 3-1/2" diameter, stacks to 4-¾" high. Ages 6 months and up.