taa0007 's Japan Review

It is the cheapest flight protector available, and if you have never used it before, I recommend you give it a try.

Flight protector protects the center of the flight.
When installed, the flight opens at exactly 90 degrees.
It is relatively easy to remove because there is a recess to catch the fingernail.

Hard to dislodge! But the flight shape fixation is neither good nor bad.