The mark consists of a three-dimensional configuration comprising product design in the nature of a rim used in connection with a disposable insert for a milk warming device. The rim includes a widened front lip, and a circular portion in the front lip including a centrally located opening design. The design consists of five thin linear divots, each of which ends on one side in a raised bulbous tip, and the opposite side visually tapering into an open circle. The linear designs are arranged in a repeating pattern around the open circle and are separated spatially by equal distances. All open portions of the design are dotted out and are not claimed as a feature of the mark. In addition, the lining and stippling appearing in the mark is not claimed as a feature of the mark. The rim is designed to include a semi-clear liner that is affixed to the rim, which is depicted in the mark drawing with dotted lines for placement purposes only. The liner is not claimed as a feature of the mark.