LEKI Thermolite AERGON Trekking Poles Ultralite shafts: small diameter (16/14/12mm), 7075 heat-treated shafts reduce weight without sacrificing strength or durability Aergon Grip - Large support area on top of the grip for secure hold; an edgeless outer shape offers a variety of gripping options Super Lock System (SLS) is the strongest pole locking system available as tested by TUV LEKI's new grip shape and design incorporates the Positive Angle INTO the grip which gives this pole a smaller packing size Concave, cylindrical carbide tips offer secure hold on all terrain Secure adjustment hold with the least amount of torque offers secure, reliable support up to 6x more secure than other locking systems Surfaces, Carbide is extremely hard and durable; entire tip ferrule is replaceable