For racing drones, these polycarbonate HQ 31mm Ultralight 3-Blade Propellers play a crucial role in ensuring more flexible flight performance, while a straighter blade and larger pitch design results in more direct responsiveness and precise movements. It outperforms in terms of strength, responsiveness, durability, and flight stability. Experience superior competition performance and create racing speed legends with it. Specification Item: HQ 31mm Ultralight 3-Blade Propellers (1.0mm Shaft) Color: Transparent/Grey/Cyan/Pink Weight: 0.67g/set Blades: 3 Materials: Polycarbonate Prop Disk Diameter: 31mm Shaft Hole: 1.0mm Diagram The picture below is the HQ 31mm Ultralight 3-Blade Propellers (1.0mm Shaft). Recommended Parts Motor: 0702 Brushless Motors, 0702E Brushless Motors, 0802SE Brushless Motors Quadcopter: Meteor65, Meteor65 Pro, Air65 Package  2 * HQ 31mm Ultralight 3-Blade Propellers CW 2 * HQ 31mm Ultralight 3-Blade Propellers CCW