The F10511/2 BK008 from Alpha Wire is flexible black heat shrink tubing with a 1.500" (38.10 mm) diameter, a 2:1 shrink ratio, and a length of 25.0' (7.6 m).
The F10511/2 BK005 from Alpha Wire is flexible heat shrink tubing, 1.500" (38.10 mm) diameter with a 2:1 shrink ratio, black, supplied in 100.0' (30.5 m) lengths.