This is a GemFan 9x4.7 Normal Rotation Carbon Filled Propeller. GemFan produces some of the finest Multi-Rotor propellers available. The High-Strength props are made from Nylon with Carbon Fiber fill for an extremely stiff blade that will not deform under load. These props are about 10 times stiffer than the standard GemFan Multi-Rotor props. "Normal" rotation is clockwise.