They are made of aluminum and consist of a stainless steel mesh screen

Includes 3/4" O

Machined From Solid Brass

Exhaust Duration: 256°

Sprocket Shaft Seal Assembly Replaces OEM 24776-40 Fits Harley-Davidson Big Twins 1936-54

Replacement Dished Sprocket - Black - 49 Tooth - 1973-1985 Harley-Davidson Big Twin 1979-81 XL Color_Amber They are made of aluminumThis Replacement Dished Sprocket has 49 teeth and stock 6mm offset. This sprocket fits 5 speed models and replaces Harley Davidson OEM# 41470 73 (stock 51 tooth sprocket). See Additional Information below for fitment. High grade carbon steel replacement rear wheel sprocket 1. 9" center hole Black finish