Features: Durable in use, easy to install. Plastic material, safe, eco-friendly, durable for playing. 8045 propellers only,other accessories demo in the picture is not included. Length:Approx. 8 inches (20.32CM) Torque: Approx. 4.5 inches Thickness of center: 9.2MM Front hole diameter of center hole: 6MMThe hole diameter on the reverse side of the central hole:9MM (this hole can be inserted into the lower propellers pad) Specifications: Material:ABS Length:Approx.20cm/7.87in Color:White,Black,(Optional) Note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 4Pair RC Propellers