Coolplay UDI U817 U817C U817A U818 U818A Main Blades Props with Mounting Screws Spare Part Crash Kit for Udric RC Quadcopter (Pack of 16) Ultra durable & light weight Super balance with stable performance Completely compatible for UDI U817 U817C U817A U818A RC Quadcopter Comes with 16pcs mounting screws,great to have on hand for easier replacement Package included:16pcs props,16pcs mounting screws