This is a Yellow 1??" Snap-On Spinner from Carl Goldberg Models. FEATURES: Yellow nylon construction. 4-pin spinner takes larger props, shafts and hubs without sacrificing performance or convenience. The improved 4-pin design fits most props, eliminating reaming the back plate or trimming the spinner. Pre-balanced, lighter than aluminum and free of unsightly surface screw holes. Perfect shape and polished finish. Carded packaging. INCLUDES: One Yellow 1??" Spinner SPECS: Diameter (at base): 1.50" (38mm) Length: 1-5/8" (41mm)GoldbergPart GBG127