SSE&reg; 2 Pairs 1345 Self-tightening Carbon Fiber Propeller Blades for DJI Inspire 1, Inspire 1 V2.0, Inspire 1 Pro, Inspire 1 Raw Self-tightening design avoids prop becoming loose during operation and potentially flying away Each propeller is made with Carbon Fiber, ensuring stable flight Silver is clockwise and black is counter clockwise Higher tension and very easy to install No need for adapters!