Lyon 11mm Dynamic Rope 50m – Our 11mm Dynamic single rope in a 50 metre length. Made by Beal for Lyon this Classic Dynamic rope has a low weight (for it’s diameter) and take an impressive number of falls. Dynamic ropes must be used during certain procedures to absorb the energy of possible falls. This 11mm diameter rope is popular where traditional belay devices are used that require the use of larger, more traditional, diameter ropes.