I-tubs esebenzayo: ubhedu, ialuminium, nylon. I-Opper Tub I-1. Gcina ityhubhu yobhedu kwindawo yoqhagamshelo kwaye yandise ezantsi, isikhafu kwi-tube yeoyile.2. Yiva isikhuseli ezantsi kwaye emva koko qinisa kancinci qho. Emva koqhagamshelo, itywina lingaphelelwa lixesha, i-shrinkage, itshixa umbhobho wobhedu.
