Changes outer diameter section by section within one tube. Stretching, extrusion and welding are all available; most often used to taper the distal end down.
Mark the OD of each section and the transition length on the drawing.
Used on catheters that need a slim distal end for access and a heavier proximal end for support. Often run together with tip forming.
Inner diameter, wall thickness, length and operating environment — those four settle the item. We reply with TDS, MSDS and MOQ.