Tupperware white domed sipper seals set of 4. Can be used with the bell tumblers both 7 ounce or 10 ounce size. Tumblers are not included. Can also be used with Tupperware 12 ounce tabletop stacking tumblers or 16 ounce classic straight tumblers and others that will accommodate a 3 inch diameter seal. Sipper seals help to minimize spillage while children and toddlers are learning to feed themselves. Dishwasher safe.