The Airlock Schrader Valve Tubes are self-sealing bicycle tubes featuring a powerful Airlock sealant that coats the tube for permanent protection against punctures. The sealant is designed to work continuously to prevent slow leaks, so you won't have to worry about flatting when riding over debris. The homogenous design addresses the common issue of sealant pooling, ensuring the tire and tube combo will always roll smooth and even. The non-toxic, non-separating formula will not dry out like many other sealants on the market.