be light for maximum responsiveness. The F4S compared to the F3S has a little more pitch for some extra bite. Pick a color! These are the updated F4S propellers without the manufacturing defect. Check out the rest of our 5 #34; Propellers here! Specifications Material: PC Weight: 3.6g Pitch: 3.6in Prop Dia: 129mm Center Thickness :6mm Center Hole Dia: 5mm Quad weight 550-750g Recommended Motor 4S 2300-2500kv 6S 1650-1950KV Includes 1 set of propellers