Custard cup will say 6 oz - 177 ML in the bottom of the glass. Look at this closely to confirm this is the lid you need before ordering! If you have the lid you are replacing, please verify the ZLID# listed on the underside of the original cover to confirm correct replacement. For example, the custard cup original lid says Z401P, so this is the proper replacement piece
Care & Use for the plastic lids:
Top rack dishwasher safe.
Not for conventional oven use.
The plastic lids are microwave safe and can be used to safely reheat foods to a temperature comfortable for eating. The lid must be placed loosely on the glass dish (not sealed) when reheating. Do not reheat foods longer than 60 seconds. Once reheating is completed, remove lid from dish to prevent warping. These lids are not intended to be used for cooking