This propeller is made of high quality Fiber Glass， which is extremely lightweight and durable and It is just designed for 600 RC helicopter . You can expect an increase in overall motor efficiency with this excellent propeller.<br> <br> Description:<br> Fiber Glass 600mm main blades<br> Material: Fiber Glass<br> High Thrust<br> High durable<br> Extremely lightweight<br> Suit for RC 50 class helicopter !#!amp!*! 600 helicopter<br> <br> <br> Parameter:<br> Length: 23.6 Inch/600mm<br> Material: Fiber Glass<br> Shaft Hole diameter: 3.8mm<br> Product weight: 254g<br> <br> Package information:<br> Package size: 60 * 5.5 * 1 cm / 23.6 * 2.2 * 0.4 in<br> Package weight: 260g / 9.2 oz<br> <br> Package list:<br> 1 * pair Fiber Glass 600mm main blades<br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>