... mainly applied to autos. motorcycles,or other motor vehicles. flexible hose is mainly applied to autos. motorcycles,or other motor vehicles ... .2 The outside material is PVC material, the middle is metal,the inner is PE material.3 They are made accords ... Φ7 Φ8 Φ9 Φ10Φ7 Φ8 Φ9 is double thread hose,or clearance hosematerial:outer:PVC or PEinner:PEmeddle:steel wire