The Q2-F-3/64-01-SS1000FT from Qualtek is flexible black 2:1 heat shrink tubing with a 0.046" (1.17 mm) wall, 0.167' (50.80 mm, 2.00") long, sold in packs of 50.
The Q2-F-3/64-01-QX50FT from Qualtek is flexible black heat shrink tubing with a 2:1 shrink ratio, 0.046" (1.17 mm) diameter and a length of 50.0 ft (15.2 m).
The Q2-F-3/64-01-MS100FT from Qualtek is black flexible heat shrink tubing with a 0.046 in (1.17 mm) diameter, 2:1 shrink ratio, supplied in 100 ft (30.5 m) lengths.