Zebra Technologies Zebra Lunch Box 2-Tier Stainless Steel Bento Box Diameter: 10cm I used this for about six months and then stored it. It shows signs of use, but it's still usable. Please understand that there are some minor scratches before purchasing. Quoted from the site: Color: Silver Material: Stainless Steel Material Features: Heat-resistant, Dishwasher-safe, Durable, Non-porous Features: Heat-resistant, Shatterproof