The F221B3/4 CL207 from Alpha Wire is flexible heat shrink tubing with a 0.750" (19.05 mm) diameter, a 2:1 shrink ratio, in clear color, supplied as 4.00 ft (1.22 m).
The F221B3/4 CL203 from Alpha Wire is flexible clear heat shrink tubing with a 0.750" (19.05 mm) diameter, a 2:1 shrink ratio, and a 250.0' (76.2 m) length.
The F221B3/4 BK207 from Alpha Wire is black flexible heat shrink tubing with a 2:1 shrink ratio and 0.750 in (19.05 mm) diameter, supplied in a 4.00 ft (1.22 m) length.