The next time you're looking to enhance the efficiency your pipe insulation, you'd be wise to consider doing it with pipe insulation from K-Flex USA. Made for 1/2" iron pipes, this 6 ft. nbr/pvc based elastomeric pipe insulation provides 1" of insulation. Unslit insulation is perfect for easy installation. An approximate R-value of 7 leads to prime insulating power and better performance. This pipe insulation is GREENGUARD Certified. It comes in black.