The listings show plate diameters ranging from about 7.5 inches up to 11 inches. Common sizes include 8", 8.5", 10.25"–10.5", and 11".
Yes. One listing offers a 100-pack of disposable paper ice cream cups. Each cup holds 5 ounces and is made from a robust, leak-resistant paper construction intended for single-use dessert service.
Most dinner plates are described as microwave-safe, and many list oven compatibility. One coupe-style porcelain specifically notes oven use up to 225°F; other oven-safe claims typically do not include a stated temperature.