SummitLink Tool-Free Quick Snap On/Off Prop Guards 2 White 2 Black for DJI Flamewheel F450 Prop Guard for DJI Flamewheel F450 Tool-Free Quick Snap-On Propeller Protector 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 F450. With these prop guard, you will never break your props and crash your F450 by accidently bump into trees, walls, or any other obstacles.