4.75x4.75 Speed 400 Electric Propeller from APC - LP04747E
Computer-optimized design gives these props a thinner profile and more "bite" with less noise Lightweight molded nylon construction reduces rotating mass for higher output and longer life Reinforcing carbon fibers help maintain true, constant pitch at any rpm.
Includes:

One carbon-reinforced NYLON propeller

Optional:

All propellers should be balanced before use. We recommend using the BenchCraft Precision Propeller Balancer