Bike Frame Internal Housing Damper Practical Bike Inner Line Sound Absorbing Tube Soundproof for MTB Road Bicycle Shifting Cable. Feature: 1. Applicable: Suitable for variable speed/brake line/hydraulic tubing within 6mm outer diameter. 2. Foam Sleeve: Made of high-quality materials, foaming sponge will not damage the frame. 3. Sound Absorbing: Reduce the abnormal vibration of wire tube/oil pipe in the frame. 4. Internal Housing Damper: Many frames use internal cable routing for a tidy appearance and improved aerodynamics. 5. Satisfaction Guarantee: We strive to provide each customer with the highest standard of customer service to ensure you have a pleasant shopping experience.