Our unique SPIN-CAST molding creates dense, firm tread area while keeping the side wall area flexible for a smooth, pneumatic like ride. Classic material in dark grey color and white color fills are for heavy duty applications. Comfort track material in green color is softer, more air-like ride. Our Dual Density Foam Fills are a perfect combination of Aero-Flex I and II compounds offering best in the market performance and durability. CEW specializes in high-volume production.