Kinetic's Go Green Glasslock Plus Series uses tempered glass that is resistant to staining, durable and safe! The container is microwave safe (without a lid), BPA-free and non-toxic, 100% airtight with a watertight silicone seal. Every Glasslock Plus unit is oven safe up to 450 degrees Fahrenheit, refrigerator safe, freezer safe, dishwasher safe and freezer-to-microwave safe. Glasslock Plus is a simple design created for oven/microwave to table use and is environmentally friendly. This set includes three 37 ounce containers with lids included. Backed by a one year limited warranty.