Inner Tube Usage Precautions: Before installation, clean the inside of the outer tire to remove any sharp debris or stones that may be present. It is normal for a newly inflated inner tube to have uneven inflation, as the rubber thickness may vary. The valve area may be slightly thicker, resulting in different levels of expansion under the same pressure. However, once installed and encased within the outer tire, it can be used normally without any quality issues. Damages to the inner tube caused by improper installation or punctures after use, which result in air leakage or other non-quality issues, cannot be eligible for returns or exchanges. To ensure the longevity of the inner tube, avoid prolonged exposure to direct sunlight. Inner tubes are consumable items.