Ideal for educational and professional use, these fan props cater to the needs of hobbyists, engineers, and students working projects. Their aerodynamic efficiency and compact design make them suitable for wind turbine models, motorized vehicles, and other , ensuring consistent performance and user satisfaction. Features -Color:Yellow -Material:Plastic -Size:3.90X3.90X0.80cm/1.53X1.53X0.31in -High precision: crafted with high precision, these propellers enhance the fine details of your handmade models, ensuring a professional finish -Stable and efficient: the 1.5 mm hole diameter design provides stable and efficient power, enhancing the performance of your models -Wide compatibility: the 40 mm size is widely compatible with various models, making it a versatile choice for model builders -Noise minimization: the four design effectively reduces noise, providing a quiet and smooth operation for your models -Ideal for diy modelers: these propellers are practical for diy modelers, allowing you to create and diy your own model airplanes, ships, and more Package list: 20pcs x micro propeller