THICKNESS-this pipe has a 1mm wall which is thick enough to support itself and resists kinking LENGTH-this pipe is available as a single length up to 100m,multiple lengths ordered will be sen as a single length unless directed not to do so SIZE this pipe has an internal diameter of 4mm and an external diameter of 6mm TINTING-the tint helps prevent build up and growth of algae on the inside of the pipe which can cause blockages and water discolouration, Manufacturer: Cost Wise