Na’urar wanki na roba wani nau’in gasket ne na roba mai lebur, madauwari, kuma yana da rami a tsakiya.An ƙera shi don samar da tasirin kwantar da hankali da hana ɗigogi tsakanin saman biyu, kamar goro, kusoshi, ko sukurori.Ana amfani da wankin lebur na roba a cikin aikin famfo, motoci, da aikace-aikacen inji.Ana yin su sau da yawa daga kayan aiki irin su neoprene, silicone, ko EPDM roba, masu sassauƙa, juriya, kuma suna da kyakkyawan juriya na sinadarai.Roba lebur washers kuma na iya taimakawa wajen rage jijjiga da hayaniya, inganta hatimi, da hana lalacewa a saman.Sun zo da girma dabam da kauri daban-daban don dacewa da diamita na bolt da aikace-aikace daban-daban.