Propeller：7 1/2×7-BA; 9 Spline Tooth; 3 blades
The propeller is made by Aluminium Alloy;
The inner rubber:
The inner rubber sleeve is made of natural wellhead rubber. After hitting an obstacle, the sleeve will not slip.
it buffers the vibration well to protect the motor.
Blade size：diameter: 190mm/7.5″，length: 45mm
Also Matched with 2/4 power stroke motor and 4/5/6 horse power