Bark+™ dispenser self catches the bag along the perforation line and tears with one pull. When used in conjunction with Bark+™ biodegradable waste bags, the dispenser is amazing. One pull, self tears, and you're done. No need to look for the perforation line. No unraveling of bags. Ever. Coreless by design. When you are done with your roll, there are no plastic or paper cores to throw away. No extra waste.