This is Ben Buckle's well known 'wet strength' medium weight tissue that they have been selling at the shows for many years.
It comes in one piece 46 cm (18 inches) wide and 6 metres (19 ft 8 inches) long and is supplied folded into a wrap 500 cm wide which is then folded down to a pack size of 9 inches by 10 inches and supplied in a poly-bag. The picture shows the 500 cm wrap on the right and the finished pack in it's bag on the left. The 12 inch steel rule in the foreground helps to show scale.
This tissue has been proven under flight conditions by many modellers and works well with Mylar and also takes onto sheeted panels very well
Supplied in these sizes this tissue works out far cheaper than may other tissue type coverings supplied by other model hobby suppliers.