The F221B3/64 BK100 from Alpha Wire is flexible black heat shrink tubing with a 0.046" (1.17 mm) diameter, a 2:1 shrink ratio, and a 4.00' (1.22 m) length.
The F221B3/64 CL205 from Alpha Wire is clear flexible heat shrink tubing with 0.046" (1.17 mm) internal diameter and a 2:1 shrink ratio, supplied in a 1000.0' (304.8 m) length.
The F221B3/64 CL100 from Alpha Wire is flexible heat shrink tubing with a 0.046" (1.17 mm) diameter, 2:1 shrink ratio, in clear, supplied in 4.00 ft (1.22 m) lengths.