The F1053/64 BK008 from Alpha Wire is black flexible heat shrink tubing with a 0.046" (1.17 mm) diameter, a 2:1 shrink ratio and a 25.0 ft (7.6 m) length.
The F1053/64 BK001 from Alpha Wire is flexible black heat shrink tubing with a 0.046" (1.17 mm) inside diameter, 2:1 shrink ratio, supplied in 1000.0' (304.8 m) lengths.
The F1053/64 BK002 from Alpha Wire is a flexible black heat shrink tubing with a 0.046" (1.17 mm) diameter, 2:1 shrink ratio, supplied in a 500.0' (152.4 m) length.