Hobby-Ace 6 inch Paddle Props Protective Circle for Mini FPV Quadcopter QAV250 etc Paddle protective circle of 1.5 thick fiberglass panels carved from screw assembly with M3 * 8 6 inch are generally cross machine When hit wall,tree or whatever, as long as the propellers rotate, your phantom will always keep balanced. It will stay in air instead of dropping down. Light weight protect your props from breaking or hurting people. More propller propective circle product is provided by Hobby-Ace on Amazon.Bring your eyes into the sky and racing like a free bird, enjoy the ultimate first person view experience.