One unique advantage of using 3 blade propellers on a quad, is that you can get the equivalent lifting area of a bigger propeller in a smaller diameter . In other words it allows you to put a big prop on a small quad. Triple blade propellers are not just for quads, they work great for airplanes too. 3 bladed propellers run quieter and produce a lot of thrust for their diameter. These props come in both glass and carbon composites and also include 3, 4, and 5mm adapter rings, except for the 10X6X3 which includes 3, 4, 5, and 6mm rings.. Sold in Pairs.