Our motorcycle outer casing are smooth and no clearance,low friction, noiselessness,portable,no shaking,easy installation,etc. 1) Name-- motorcycle cable casing ; outer casing ; cable casing ; cable hose ; cable outer,etc..2) Diameter--5mm,6mm,7mm,8mm,9mm,10mm,11mm, 12mm,etc.3) Construct--1p and 2p construction ( 1P means wihout linner or inner plastic ; 2P means with linner or inner plastic) 4) ...