These bullnose propellers are 6x4.5 / 6045 and are made from orange nylon, they are supplied as a pair, one CW and one CCW. The bullnose propellers are made from tough nylon which are great to deliver the motor power and thrust, they do this by a reduction in efficiency over traditional propellers. The slight loss in efficiency is an accepted loss due to the advantage these props give in performance while FPV racing.
The 6x4.5 inch prop size is suitable for use on First Person View racing Drones that take a 6045 sized propeller. The centre mounting hole is 5mm on the hubs of these propellers.
Using the bullnose propellers on your racing drone will increase the thrust and result in higher speeds, faster stopping times and quicker turning speeds.