1.Size:300-18 2.Material: butyl rubber 3.Rubber content:30% 4.Various sizes available; 5.Puncture-proof ... and maintenance-free Butyl motorcycle tube 300-18:High ... Size available:250-17,250-18,300-17,300-18,225-16,250-16,275-16,300-16,350-16,225-17, ... 18,250-19,375-19,400-19,350-8,400-8,450-12,350-10,300-10,110/90-16,130/90-15 ...