This quadrant is made from aircraft quality anodized aluminum for long life and corrosion resistance. Brass friction plates are adjustable to fit individual preferences. Black anodized top plates are machined and engraved on a CNC mill to exacting tolerances for an excellent finish. side plates are laser cut insuring a perfect fit and feel. All hardware used meets AN standards. Note: All throttle quadrants require a AN665-21R clevis with an AN393-11 clevis pin. The friction system is split to isolate the throttle lever from the prop and mixture levers.