Corelle Bake, Serve, Store dishes are made of the same light weight, yet durable Vitrelle glass. This square bakeware dish has a super smooth non-porous surface that makes for easy food release. It's also dishwasher safe, so cleanup is effortless. The entire collection of bakeware, glass and plastic lids nest and stack within 30.48cm for space-saving storage in small urban spaces and those with limited cabinet space. Corelle products can be used for serving and re-heating food in microwaves or pre-heated conventional ovens up to 176 Degrees. To warm empty dinnerware for serving, use pre-heated conventional ovens only.