Celsus 10455 Dynamat Xtreme, Black,18" x 32"

Hi,. what is difference between dynamat 10455 as supplied by dynamat, by celsus or ny china? the price of by dymamat seems three times the others?

how many sheets do you need a mid-size car

does it offer insulation keeping the van warm

Will you send to Northern Ireland or is there a distributor here?