YKS 8 Pairs Plastic 5045 Propeller Bull Nose for Mini 250 Quadcopter (Black, Pack of 16) Made of high quality ABS Plastic ,ultralight and flex. Well balanced, well-made and durable to sustain crash. Great for racing QAV250 Quads Multi-rotors. Weight: 10g (0.35oz)/ pair High hardness and elastic deformation is very small, which can increase the flexibility of the aircraft, stable connection, easy to install, good for each blade.