SKYREAT Snap On/off Prop Guards Guard-Quick Release Propeller Protector for DJI Phantom 4 / 4 Pro Quadcopter Prop Guards for DJI Phantom 4 Quadcopter With these prop guards, you will never break your props and crash your Phantom by accident bump into trees, walls, or any other obstacles. Phantom 4 added the Obstacle Detection System, the Obstacle Detection System Mounting and Unmounting takes only seconds. Tool-free installation. Light weight protect your props from breaking or hurting people.