ptfe tube,FEP hose, plastic tube,soft tube,teflon pipe. OD: 12mm; ID: 10mm Tolerance: +-0.1 ptfe tube,FEP hose, plastic tube,soft tube,teflon pipe.OD: 12mm; ID: 10mmTolerance: +-0.1 Teflon tube 1.Any size is available2.lowest friction3.high chemical properties4.anti-corrosive5.nonstick and does not age.6.it is transparent can see inside.