Gemfan Propellers have set the gold standard in the small class multirotor community. These 3 bladed propellers supply an excellent amount of thrust and a smooth flight through all throttle ranges for that locked in feel perfect for your 100 to 150 size quads. Known for their durability, great balancing and superb hub centering and expendable price. They come packaged as a set of 2, with one CW and one CCW. These Polycarbonate blades are stronger and less prone to breaking if you clip a gate or a tree so you have a better chance of finishing your race or joy flight.