I tie a lot of rigs using tubing over the hook, both silicon tubing and shrink tubing, almost every rig has tubing as I have seen fish manage to eject rigs on a plain knotless knot and hair. Blooming annoying when you are up close and personal, no more than 3metres away from the biggest fish in the lake!
So I use a line aligner to prevent that happening again.
The tubing I use is whichever silicone tubing goes over the eye, or quite simply shrink tube purchased from Maplins, and I honestly don't care that it is black and has white printing on it. The black is not going to stand out on a lakebed, not in that tiny length.
As Nafy says, almost every hook link material, although the only rigs I don't use it on are out eyed hooks.