Cups are made from 18-8 stainless steel and snug-fitting lids are made from BPA-free LDPE plastic. Store prepped foods, dressing, dips, condiments, or home-made herb and spice blends. Pack into lunch bags with snacks or treats or use the 3-ounce capacity for potion control. Each cup measures 3 by 3 by 1 inches with a 3-ounce or 100 ml capacity.