Scallop edges. Hmm. Merriam Webster says that a scallop can be defined as: any of numerous marine bivalve lamellibranch mollusks (family Pectinidae) that have a radially ribbed shell with the edge undulated and that swim by opening and closing the valves. Another definition is: one of a continuous series of circle segments or angular projections forming a border. THAT's more like it! In any case, no sea animals were harmed in the production of this Creatopia Borderz Roller sets that you are about to buy.