The maximum tear resistance is achieved by the two multiple solid ropes reinforced with arms. Tested for durability and flexibility in temperatures from -30°C to +50°C, these heavy-duty balloons feature high friction resistance and high energy absorption (up to 3.8 tonnes for F-13), making them suitable for vessels up to 1500 tons (F-13). Essential for recreational boats, the F series cylindrical balloons are widely used by passenger ferries, fishing, and commercial ships.