Frost King Pre-Slit, Tubular Polyethylene Foam Pipe Insulation, 3/8" Thick Wall, 3-Feet 3/8in thick wall, bulk 3Ft lengths 4 pack - 3Ft closed cell polyethylene foam, pre-slit Fits 1in Copper or 3/4in iron pipes Prevents pipes from sweating and dripping R-value 2.1 3-Feet Black Tubular Polyethylene Foam Pipe Insulation Helps To Prevent Pipes From Freezing Or Sweating Comes Pre-slit, With Heavy-duty 3/8-Inch Wall Thickness For Use On 1-Inch Copper Pipe, Or 3/4-Inch Iron Pipe Comes With 4 To A Pack