Snapware Airtight Clear Round Lid w/Blue Rubber Gasket (2 Pack) for 0.5 Cup Plastic Container (Will NOT Fit Snapware Glass Containers) Snap Lock Lids are airtight and leak-proof for secure storage Gasket easily Removed to wash before use to optimize seal Microwave, top-rack dishwasher, and freezer safe 100% BPA Free Plastic Made in the USA