A very simple solution to prevent the props hitting your wires.
Install them at the point on the arms where the prop bends down to the arm.
From here on in when the prop strikes the arm you don’t slash the motor wires.
Perfect with 4 in 1 ESCs.
1.0mm PCB FR4 2oz copper
Tracks doubled on both sides of the PCB for current handling capacity.
Designed for up to 6S
40mm x 8.5mm x 1.0mm
25mm x 8.5mm x 1.0mm
4pcs Prop Skid ( 25mm or 40mm you choose)