SUNMATE™ is the industry leader in hi-performance electric skateboard pneumatic A/T tires. This tire is designed to fit all standard size 6" [150mm X 50mm] e-skate hubs. This tire REQUIRES a tube. We also HIGHLY recommend using our Tire Candy Tire Sealant with this product to insure you are not left stranded on the side of the road! Tire Candy is a premium tire sealant that fills/repairs punctures caused by objects up to 1/4" in diameter. Each bottle of Tire Candy comes with a valve core removal tool and new valve core. Use 1 bottle per tire.