Heavy-duty ship fenders feature maximum resistance to breakage, as they consist of two multiple solid ropes reinforced with arms. They have been tested for durability and flexibility at temperatures from -30°C to +50°C. These fenders offer high abrasion resistance and high energy absorption, reaching up to 3.8 tons for F-13, making them suitable for vessels up to 1500 tons (F-13).

In addition to their application on recreational boats, the cylindrical fenders of the F series are widely used by ferry vessels, fishing boats, and commercial ships.