pvc tarpaulins made from pvc sheet and polyester fabric,at the first times,we need cut the fabric according to the  customent’s sizes. then we welding two pvc fabric on the tarpaulin machine. usually we take the rope surrounded on the four sides of tarpaulins. aluminum buckle is one meter by one meter.if you want to buy high quality and cheap tarpaulins ,please contact Topbon tarpaulin,..........com,