Vktech&reg; 4pcs Propeller Prop Protector Guard Bumper Blade Ring for DJI F450 F550 4 prop protectors a set Suitable for DJI F450 F550 Dimensions: 8.27 inch x 4.33 inch x 0.39 inch (21 cm x 11 cm x 1 cm) Protect your props from scratching and breaking