Du-Bro's 6MM Drone/Quadcopter Prop Balancer works with any drone that has a prop diameter of 6MM like the DJI Phantom, Blade Chroma, Hubsan X4 Pro, 3DR Solo, Splash and more. This shaft is included here with the most precise balancer on the market. The balancing shaft is manufactured out of hardened material and then is center less ground giving precision balance every time. The prop balancer's aluminum wheels turn virtually friction free for precision accuracy. Each balancer comes complete with easy to follow assembly and prop balancing instructions. A truly precision instrument built for the modeler who expects the very best.