100% Aluminium Imported ASSISTED BLOCKING: Features a cam-assisted blocking system that improves belaying comfort; when the climber falls or weights the rope, the cam pivots to pinch and block the rope automatically. BROAD COMPATIBILITY: Compatible with all single dynamic ropes from 8.5 to 11 mm (optimized for 8.9 to 10.5 mm); ideal for both gym and outdoor rock climbing. SMOOTH LOWERING: The ergonomic handle allows you to easily unblock the rope and lower someone; the progressive cam action ensures a smooth, controlled descent. INTUITIVE DESIGN: Rope installation diagrams are engraved on both the interior and exterior of the device to minimize the risk of error; uses standard belay techniques. LIGHTWEIGHT & DURABLE: Constructed with aluminum side plates and a stainless steel cam/friction plate for durability; weighs only 175 g.