Qualtek offers, broadly, a selection of power and cooling products and accessories. One such option is Q2-F-1/8-01-MS100FT, simple heat shrink tubing to help with cable management. We’ve had some questions recently on unit of sale for this heat shrink, and what any given qty. 1 yields.
This particular tubing, under the linked DigiKey part number Q2F018B-100-ND, is sold in hundred-foot spools. Other options are available in other lengths, available here: Q2-F-1/8 Tubing.