They actually have scales on them. If you salt them and let them sit our for a bit, the scales will slip off in one big sheet.
I get boxes of skinned salted tails shipped to me several times a year. Usually about 200 pieces at a time. I don't know how long the skinner had them sitting out, but you know that they sit out for at least 3 days during the shipping process.
Many have slipped by the time I receive them and then there is the shipping to my tanner.
Once I asked them if this was an issue and they said it actually helped since they had to remove that scale before tanning.
I have thrown away many tails tanned in ways that wouldn't work for grips. In fact not all tails I get back from my current supply cut the mustard.
If anyone is interested, I will trade a fully tanned and dyed tail piece (one side) for 6 skinned, fleshed, salted and shipped sides. The pieces must be free of holes and at least 5 1/2" wide green. Those things shrink up a bit during the tanning process.
I wish I could find a market for the smaller tails as I probably turn down a thousand plus tails(however many would fit in three 55 gal drums) each year.
Thanks, bigjim