Tupperware

These forms look really well resolved. Here are the stats on the product:

Crafted from a virtually-unbreakable material
Store, freeze, microwave, reheat and serve, all in one container.
Sleek, beautiful design and Cosmos Black finish are ideal for any serving setting.
No-worry valve is the first of its kind on the market; automatically adjusts to allow steam to escape during microwave reheating.
Raised hub in center of base ensures even heating of contents, from center to edge.
Complements our entire line of Heat 'N Serve™ Containers.