Heavy-duty balloons feature maximum resistance to rupture due to the two multiple solid ropes reinforced with brackets. Tested for durability and flexibility at temperatures ranging from -30°C to +50°C, they offer high abrasion resistance and energy absorption up to 3.8 tons for the F-13 model, making them suitable for vessels up to 1500 tons. These cylindrical balloons of the F series are essential for recreational boats, while they are also widely used by coastal ships, fishing boats, as well as commercial vessels.