The fine pore, silk-like to the touch, Grand Prix Cover is perfect for fine particle sand conditions. It has elastic around the bottom of the cover that allows it to sit perfectly around the air filter, preventing fine particles entering the filter and in turn your engine. The Cover will act as an additional layer of protection and extend service time between filter cleaning. Grand Prix cover - 160000GPH3 HONDA CRF250R 25- CRF450R 25- CRF250RX 25- CRF450RX 25-