The Gemfan Flash 2540 Props come as a set of four including 2 CW and 2 CCW propellers.  They have a double m2 screw mount hub for 11XX motors. These propellers are made of polycarbonate and are incredibly durable.

NOTE: This includes two complete sets of props

Specs 

• 2.5 inch triple blade propeller
• 2.5x40
• Mount with 2 x M2x7mm screws
• Polycarbonate

INCLUDES

• 4x CW Prop
• 4x CCW Prop