OXO Good Grips Smart Seal Glass Airtight Containers offer a safe, easy, attractive solution for fresh food storage. Four locking tabs and a removable silicone gasket form a strong, leakproof seal. The BPA-free borosilicate glass is stain-proof and can withstand extreme temperature changes without cracking. The elegant design looks great in any kitchen or on any dining room table. Smart Seal Containers are dishwasher safe and stack in your fridge or freezer, or nest in your cabinet. Bodies and lids are microwave, freezer and dishwasher safe. This set includes two 4 oz Containers with their leakproof lids, and the small size is great for dips and sauces.