This is the Castle Creations 'CC Blower' Fan Shroud, intended for usewith Neu-Castle 15 series motors, as well as motors that have outsidediameters between 1 1/2' and 1 7/8'. Pushing your Mamba Monster to themax? Just the type who likes the motor as cool as possible? No matterwhich category you fall under, Castle has the solution! The new CCBlower plugs directly into your receiver for power, and can drop motortemperatures as much as 30 degrees!* A must have for any hardcore basher or temperature freak, get yours today! Your Mamba Monster will love you for it!