These lite-weight high RPM 9 x 5.0" triples props are a matching set of 4 x CW(R) and 4 x CCW(standard) low pitched GWS9050 multicopter props. These GWS 9050 and 9050R are the bomb on 4S 750-800kva motors for Multicopters. They are very easy to balance with tape on a magnetic balancer and run extremely smoothly. Once you have worked out the balance for one - they are all the same. The real bonus of these props over the 2 bladed slow flyers is they hold their tip tracking at much higher RPM, yet they are so light they chage RPM very rapidly and have NO gyroscopic-precession feedback when twisted rapidy - as you would when doing hard manoeuvres in a Multicopter - Sure we all know they wives tales about triples being hard to balance - and we are aware that two bladers are more efficient - but after doing a lot of real world perfrmance and balancing tests - we HIGHLY recommend these for 4S 750kv CarbonBird motors - and Gello Free filming when balanced out.