The Mr. Bento® Stainless Lunch Jar contains four microwaveable inner bowls. The outer container features durable stainless steel construction and vacuum insulation with excellent heat retention. High quality vacuum insulation keeps soup and main bowls hot or cold 2 side bowls stay at room temperature, divided from the main bowl by an insulating inner lid All 4 bowls stay nicely contained in jar with a clip-on lid 4 microwaveable* inner bowls (*excludes inner lids) Made of BPA-free plastic and stainless steel