These can be used right out of the package without balancing for normal flying. I would balance them if using for video to be sure of best quality.

These props are for the full size tricopter, Tcopter and Vtail (tilt)

These go on the leftt front and rear on the tri and T and on the leftt front and right rear of the vtail

Also included with the props are two sets of adapter rings that step down the
center hole of the prop to allow it fit on different motor adapters and shafts.
If you have a larger threaded shaft on your prop adapter, the center hole can be
reamed out to a larger size as needed.

Note: This
product contains 2 reverse rotation (clockwise) propellers as well as
adapters in each package as you see in the product photo.