... good air-tightness 5,long mileages Description of goods: Butyl motorcycle inner tubesize:3.00-181,own brand:WINHUA2 ... ,ISO9001 INMETRO SONCAP,CIQ...we have Natural rubber and butyl rubber inner tube of motorcycle tyres,Bicycle tire,trucks ... Motorcycle inner tube are as below:Size/Specifications(Natural /Butyl Rubber)Valve modelUnit weight(kg)1.85-17TR40.272 ... 644.50-12TR40.72 3.00-18 Motorcycle Butyl tube