"Petroleum Sorbent Sweep are excellent for sweeping thin slicks on water where mechanical skimmers fail. Constructed with a durable rope encased in reinforced sorbent material, these sweeps facilitate sweeping action over large surface areas. Sweeps can also be plaed downstream from booms to recover any escaping traces of oil. Size 21 in. x 100 ft. x 3/8 in. 1 per case"