Cov qauv yooj yim ntawm cov punch xovxwm ntawm cov khoom siv blister pib nrog tus pin stopper (phaj)

Qhov pib nres tus pin (phaj) yog ib feem siv rau qhov chaw thaum pib qhov kawg ntawm cov khoom noj. Thawj tus pins nres (phaj) yog mobile. Cov khoom yog ib qho ntawm cov khoom uas ua kom tiav qhov tuag, xuas nrig ntaus, stripper los yog phaj ruaj.