Usually sealed with a heat sealer or stapler (not included in purchase). 20 x HEAVY DUTY rolls of polythene lay-flat tubing, each roll being 4" Wide x 168 metres in length, 500 gauge in thickness. The weight of each roll is 4kg. All the polythene lay-flat tubing we stock is UK manufactured to the highest quality standards. Polythene lay-flat tubing, also known as plastic clear tubing, is a transparent polythene tubing used for protecting/collating/wrapping various objects. Lay-Flat tubing is made of high quality polymers and offers strength, lubricity, chemical inertness, and biocompatibility.