Mafirita esiringa anogadzirwa neaijiren ari emhando yepamusoro, akarongwa uye anotengeswa nemitengo inonzwisisika. Ivo vakakodzera midziyo mikuru membudzi, kusanganisira nylon, ptfe, pes, mce, pvdf, ca, pp uye gf. Ivo vanowanikwa muna 13mm, 17mm, 25mm uye 30mm mafomu, uye shandisa yakachena polypropylene shell.