Snapware Airtight Clear Square Lid w/Red Rubber Gasket (6 Pack) for 1.3 or 2.8 Cup Plastic Containers (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