Material: Made from 18/8 stainless steel, FDA approved silicone, and borosilicate glass.
Small Round Capacity - Size: 0.4 L / 13.53 oz Capacity, Ø 114.5 x 57 mm / Ø 4.5 x 2.24”
Medium Round Capacity: Size: Size: 0.83 L / 28.07 oz Capacity, Ø 147 x 72.5 mm / Ø 5.8 x 2.9”.
Just push the silicone button down to create an airtight seal. Pull the button up to release the seal. Dishwasher, oven and microwave safe. ( **Lids NOT microwave safe**).