- Flexible and deformation resistant, this Cycling Sound Absorbing Foam fits most bikes, especially mountain bikes, and is suitable for a variety of road conditions and riding styles - Made from high quality PVC and nitrile rubber, the foam is wear resistant, soft and elastic. It absorbs the noise and vibration from the shifting cable tube - It helps create smoother riding by reducing the noise from the cable tube and frame on mountain bikes. It is compatible with any cable tube, including shifting cables, brake cables, or oil tubes - Easy to install and adjust with the provided instructions and accessories. No professional tools or expertise required - Use scenarios: mountain bike trail riding on rough terrain to reduce cable and frame noise; urban or road riding with external cables to lower vibration and noise from shifting and braking; bikes with external cable routing for quieter operation of shifting, brake, or oil tubes