This propeller is made of high quality carbon fiber, which is extremely lightweight and durable and It is just designed for 550 RC helicopter . You can expect an increase in overall motor efficiency with this excellent propeller.<br><br>Description:<br>Carbon fiber 92mm tail blades<br>Material: Carbon fiber<br>High Thrust<br>High durable<br>Extremely lightweight<br>Suit for RC 550 helicopter<br><br><br>Parameter:<br>Length: 3.6 Inch/92mm<br>Material: Carbon Fiber<br>Shaft Hole diameter: 3mm<br>Product weight: 10g/1 pair<br><br>Package information:<br>Package size: 15 * 4.5 * 1 cm / 5.9 * 1.7 * 0.4 in<br>Package weight: 21g / 0.74 oz<br><br>Package list:<br>2 * pair Carbon fiber 92mm tail blades