HOBBYTIGER 2 Pairs 13" Carbon Fiber Propeller Blades Prop Set for YUNEEC Typhoon Q500 Q500+ Q500 4K M8x1.25 t/mm Thread Pitch Motor Shaft Quadcopter Spare Replace Parts Self-Locking Quick-Release NOTE!! Suitable to 1.25t/mm thread pitch motor.Check your motor thread pitch before order. Works as a backup, a replacement, or an upgrade spare part Easy install Self-Locking Quick-release For:YUNEEC Typhoon Q500 Q500+ Q500 4K Quadcopter Include:2Pcs blade A + 2Pcs blade B (A is black cap; B is silver cap)