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G-50x Iso-Elastic arm with Lift and Ride control. The revolutionary, patented Geo spring geometry optimises performance throughout its lifting range. It tames high/low arm travel with adjustable-length crankshafts that dynamically rock the spring termination as the arm is boomed up or down. Powered by titanium springs, the G-50x arm smoothly carries any load from 12 to 50 pounds (5.4 to 23 kg).