The listings show two main materials: the pumpkin-style pieces are made from ceramic/stoneware (porcelain), while the larger casserole is made from stainless steel.
For the pumpkin-style ceramic pieces, lids are ceramic and handles are stoneware. The larger stainless-steel casserole uses a tempered glass lid and stainless-steel handles.
These pieces are designed for oven-to-table presentation — they’re intended to go from the oven directly to the tabletop to showcase soups, casseroles, and vegetables without transferring to other serving dishes.
Ceramic pumpkin-style dishes are intended for oven, broiler, and freezer use but are not rated for direct stovetop heat. Some stainless-steel casseroles, by contrast, are designed for stovetop (including induction), broiler, and oven cooking.
Temperature limits vary by material: the ceramic pumpkin pieces list oven use up to 572°F. A stainless-steel casserole lists oven/broiler use up to 500°F (and notes 350°F when used with the lid).
Ceramic pumpkin dishes are not suitable for direct stovetop heat (including electric stoves). Stainless-steel casseroles are stovetop- and induction-compatible and are intended for stovetop, broiler, and oven use.