Practical for educational and recreational use, these model airplane propellers are designed to be both durable and fold-resistant. They are ideal for students working projects or hobbyists building their own aircraft models. These propellers provide a practical way to explore the mechanics of flight, making them a valuable addition to any DIY aircraft tool. Features -Color:Black -Material:Plastic -Size:14.50X3.50X2.50cm/5.70X1.38X0.98in -Aerodynamic efficiency: these propellers are designed to maximize flight performance, providing smoother and more stable operation for model airplane enthusiasts -Diy friendly design: easy to assemble, this kit is practical for students and hobbyists looking to build or upgrade their model airplanes with minimal effort -Built to last: featuring fold resistant materials, these propellers are durable and reliable, ensuring consistent performance over time -Stem education focus: tailored for science and engineering projects, this kit helps students explore air concepts while enhancing their practical skills -Versatile usage: compatible with various airplane models, this set is suitable for both educational purposes and recreational flying activities Package list: 50 (hole diameter 6x4mm) 50 x