Sorry so long to reply, doing 10 3ft nets for £20 posted, but can work something out if you need anything different. The material is something aking to butchers twine, so I am assuming it is Nylon, it's good strong stuff, holds the knots really well and doesn't rot. Doesn't tangle either. All stitched to rings at both ends, and shaped at either end too.
Pictures of the nets in the for sale section still.
Thanks fat ferret, hope he's doing well so far this year too.