The DGS Ninja Aerial Barrels are constructed out of wood and then padded and wrapped in red vinyl. This obstacle can hang from each end with a chain to allow easy height adjustments. Aerial Barrels are available in four different diameters: 3 inches, 6 inches, 9 inches, and 12 inches. Each Barrel includes nylon straps, quick links, chains, and swivels for hanging.