The nibbi dual layer clamp-on air filter is designed with a "tilt" of 15º to accommodate compact or unusual installations, and a clip-on style to make it more versatile. It can be used on motorcycles, go-karts, tractors, air compressors, snowmobiles, anything with a carburetor can benefit from it. Specifications Color: inner yellow, outer black Type: 15° Material: polyurethane Size: 35mm≈1.38in / 45mm≈1.77in / 49mm≈1.92in Features Double-layer foam design, super anti-fouling ability Maintains high air flow rate inhalation performance Made of high-quality materials, durable Washable and reusable The nibbi dual layer clamp-on air filter consists of "two layers" of foam. The outer layer is black and the inner layer is yellow. Polyurethane is used as the raw material because of its excellent dirt-trapping ability and its ability to be easily cleaned and reused. Warranty 90-Day Warranty