【Airtightness test】 We put the adhesive area and the valve in the water for 30 minutes. No air escapes at all!
【Quality material】 Made from environmentally friendly butyl rubber. Butyl rubber is the most commonly used material in the manufacture of bicycle tubes. Hiland Drbike bicycle tires use high quality raw materials to ensure you get high quality tires.
【Excellent customer service】 If you have any questions about the product and its use, please contact our customer service. We will give you a satisfactory answer in time.