The F1051/8 BK005 from Alpha Wire is flexible black heat shrink tubing with a 0.125" (3.18 mm) diameter, a 2:1 shrink ratio, and a 100.0 ft (30.5 m) length.
The F1051/8 BK001 from Alpha Wire is flexible black heat shrink tubing with a 0.125" (3.18 mm) diameter, 2:1 shrink ratio and a 1000.0' (304.8 m) length.