Rubber Ducky Party Favor Box Centerpiece. One Rubber Ducky Party Favor Box Centerpiece contains 12 favor boxes that are 3" X 2" X 2 1/2" each. Fill the boxes with candy and other small favors to give to your guests as thank you gifts! Rubber Ducky Party centerpiece stands 11" tall X 12" wide when assembled with facade and favor boxes. Simple assembly required. Very cool and unique!