Seamless:pierced, redrawn, annealed (multi-pass ncig txheej txheem)
Welded:longitudinally welded, redrawn, annealed (multi-pass ncig txheej txheem)
Ntim:Tubing yog theem qhov txhab coiled ntawm cov hlau / ntoo nruas los yog spools.
Tag nrho cov nruas los yog spools tau ntim rau hauv ntoo crates kom yooj yim logistic ua haujlwm.