These are about the best Multirotor Props for a 450 sized quad - Well balanced from the factory and just glide through the air - just from the sound they make cutting through the air you can tell the quality.
10" 1000kv 3s to 4s ideal ratio
Choose colour and rotation as options
Black is Carbon Nylon - stiffer but more prone to chipping in a crash
Green and Orange is glass fiber nylon little bit more durable but not as smooth in the air as the carbon nylon.
Sold in Pairs of one rotation eg. (2 x CW)