SummitLink DJI Flamewheel F550 Prop Guard Tool-Free Quick Snap On/Off DJI Flamewheel F550 Prop Guard Propeller Protector Tool-Free Quick Snap On DJI Flamewheel F550 Prop Guard. It features too-free installation. Mounting and unmounting takes only seconds. Please refer to the listing picture for more details. They are very light weight and can effectively protect up to 10 inch props for DJI F550 and F450. With these prop guard, you will never break your props and crash your F550 by accidently bump into trees, walls, or any other obstacles.