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 and is volumetrically accurate. Cup sizes range from 1-1/2" to 3-1/2" in diameter. Made from 100% recycled plastic. No BPA, phthalates or PVC. Meets FDA food contact standards. Dishwasher safe. Packaged with recycled and recyclable materials and printed with soy inks. Ages 6 months+.