The black Cooktop is an OEM part for Whirlpool ranges. It serves as the flat surface where cooking is done by using burners or a warming element. The glass-ceramic or stainless steel cooktop provides an attractive and durable cooking area.  Symptoms of a bad cooktop include:  Cracks or chips in the glass or surface material Burned, stained, or discolored areas that cannot be cleaned Dents or depressions that collect moisture or debris Inoperable or intermittent burners or heating elements Causes of a bad cooktop can be cracks or damage from impacts or heavy pots/pans, heating element failures over time, surface deterioration from abrasive cleaners, or prolonged heat exposure.  This OEM part is also compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper, and Kenmore models.W10239357 (AP4510029) replaces 1557754, PS2376948, W10199502, W10305085.