Grey Vulcanised Back Tacking 1/2″ strip is used to give a neat edge on an outside back of a chair, settee or in other applications such as headboards etc.
It is a good idea to trap a thin (2oz) polyester wadding between the back tacking strip and your fabric to give a softer edge.
The price is per metre (comes in one length) or per 135m (apr) roll.