K-Flex USA Pipe Insulation 1-5/8" ID x 1-1/2" Wall THICK R9.8 pre-split rubber
These are used pieces of K-Flex Pipe Insulation. I believe this is the K-FLEX® INSUL-TUBE® line. I don't think it's the INSUL-LOCK because it doesn't have the flap to cover the seam. All of this tube is pre-split.