Hey guys.
The glossy heatshrink was made by Insultab Inc. in Massachusetts. I happened upon 3 or 4 50 ft. spools of this 1/2" PVC shrink-tubing and liked the looks.
I had been using 1/2" Thermafix that I got from Merithian.com. It came on a 10' roll/"Dispenser Pack" in several colors, and is about the same except for the glossy look, but I suppose most 1/2" single-wall heatshrink would be similar.