Polyethylene pipe insulation, Totally CFC & HCFC free, Ozone depletion potential of zero, Thermal conductivity of 0.034 W/m K at 0 degrees Celsius, Meets the W35 category for water regulations, Normal density 30 kg/m cubed, Suitable for all pipes with an outerside diameter of 28mm, Thickness of insulation: 19mm, Keep your hot water hot for longer & reduce carbon emmissions & control bills