The F3501/16 CL062 from Alpha Wire is flexible clear heat shrink tubing with a 0.063" (1.60 mm) diameter and 2:1 shrink ratio, sold in 0.500 ft (152.40 mm, 6.00") lengths.
The F3501/16 CL103 from Alpha Wire is flexible clear heat shrink tubing with a 0.063" (1.60 mm) diameter, a 2:1 shrink ratio and a length of 4.00' (1.22 m).