SPECIFICATIONS: Type: D51(2020) Material: PC Colors: Black, Clear Gray, Yellow, Whisky Adapter Rings: NO Package Way/Bag: 4 CCW prop & 4 CWprop 4 Blades Pitch: 1.9in Prop Disk Diameter: 50.3mm Center Thickness: 4.5mm Center Hole Inner diameter: 1.5mm (1.5mm 3holes) Max Prop Width: 10.6mm Weight: 0.91g Recommended Motor: 1103-1105kv