... Φ7, Φ7.94, Φ9.52, Φ12.7mm, etc. inner grooved or smooth tube.3. Aluminium foil: hydrophilic or bare4. Fin type: louver ... Copper, Aluminium Copper, Aluminium CopperCopperType of Tube Smooth Tube, Inner Grooved Tube Smooth Tube, Inner Grooved Tube Smooth Tube, Inner Grooved Tube Smooth Tube, Inner Grooved Tube Smooth Tube, Inner Grooved TubeFin SurfaceLouver Fin,Corrugated FinFlat Fin,Louver Fin ...