The F3501IN CL105 from Alpha Wire is clear flexible heat shrink tubing with a 1.000" (25.40 mm) diameter and a 2:1 shrink ratio, supplied in 4.00' (1.22 m) lengths.
The F3501IN CL074 from Alpha Wire is clear flexible heat shrink tubing with a 1.000" (25.40 mm) diameter, a 2:1 shrink ratio and a length of 0.500' (152.40 mm, 6.00").