Zimakhala zopangidwa ndi chitoliro chopangidwa ndi chipilala, malaya a ukonde ndi olowa. The inner tube is a thin walled stainless stell corrugated pipe with a spiral or annular shape, and the outer layer of the corrugaed pipe is made of stainless steel wire of steel tape. Zophatikiza ndi zopondera kumapeto kwa mbewa ya ar ar amafanana ndi zowonjezera ndi zopondera za chitoliro cha kasitomala.