Windy City Novelties World Cup Collapsible Stadium Horn - 28" Stadium horn also known as a Vuvuzela is a Long Plastic Horn Measures 29" long x 4" wide and compacts down to 15" long! Item is collapsible for easy carrying and storage. What is a stadium horn aka Vuvuzela ? (voo-voo-zeh-lah) - A large, colourful plastic trumpet with the sound of a foghorn, blown enthusiastically by many fans at sporting events