Nowadays paper honeycomb core is widely using in door stuffing. The honeycomb core withe excellent sound insulation, and it is very light which make the paper honeycomb stuffing door light and with lower cost.Our factory now making the honeycomb core side size as 8mm( diameter 14mm) and 12mm(diameter 21mm) for door factory.And for paper we generally use 140gsm corrugated paper. www.honeycomb-machine.com