Tmyes drone propellers are made of premium quality plastic and are very durable. These drone propellers are well-designed and balanced, making them more stable and providing longer flight times. Each pack includes 4 pieces of propeller blades,providing an extra set for your drone. These propellers are easy to install and replace, and they can improve the drones flight performance, making it more stable and easier to control. Please check the model and size of your drone before purchasing to ensure compatibility.