? HIGHEST QUALITY: The food storage containers made of tempered glass are 3 times stronger than normal glass. This improves the material's resistance to heat, scratches and shocks. ? INNOVATIVE LOCKING SYSTEM: Thanks to the glass container and the airtight plastic lids, our storage containers have an anti-oxidation function that keeps food fresh longer - no more leaks and bad smells in the refrigerator ? EXTREMELY VERSATILE: Designed for all food storage needs, the temperature-resistant glass makes the containers suitable for dishwashers, microwaves, refrigerators and freezers, -20 to 120°C ? ENVIRONMENTALLY FRIENDLY: Glasslock glass is made from 100% natural raw materials, BPA free, estrogen free, 100% recyclable to protect the environment ? ORIGIN: 100% made in Korea