Material: Plastic Size: 51mm/57mm Color: Red, Blue, Black, White 100% Brand new and high quality Name: Propeller Spinner The propeller spinner for electric/oil-powered plastic propellers mainly refers to the size of the aircraft spinner and the propeller spinner's fixed disk. Pay less attention to the matching between the propeller spinner and the propeller itself. We provide the maximum propeller size suitable for each propeller spinner (using GEMFAN APC saber propeller as a reference). Since the size of each manufacturer's propeller is different, the height and diameter of the motor's propeller clamp or the thickness or length of the motor shaft should also be considered. Currently, all spinners can only be matched with positive paddles. Due to the different shapes of the paddles, the length and size of the match can only be a rough reference. The best approach is to physically compare the paddles and spinners to ensure a successful installation! Please choose according to your own needs. If the purchase is incorrect, you are responsible for the consequences. Package includes: 1 x Propeller Spinner