I don't like anything metal personally for body, manes or tails. Too easy to damage the hair. I LOVE slick & easy blocks, but hated the price until I had a chef friend visit and he asked why I was using a grill cleaner on my horses. I thought he was nuts but it turns out they are the same thing restaurants use to clean grill grates. I now get them at a food supply place and it's a big block about 10 in long and same dimensions around as the "slick & easy" that is marketed to horse people. I get 10 blocks out of one and it costs about 2 bucks for the whole lot! Now when they get gunked up with dirt I just rasp the sides and have a new block until I shave it down to a tiny square, then my 5 yr old daughter uses them because they fit right in her hand :)
Jdw - he is 12.5% protein and gx is 14% protein
I have several most would consider seniors (22,23 & 29), but they get the GX as well. I do add a bit of beet pulp & wheat germ oil to theirs during winter months but that's the only difference. My take on seniors - age doesn't make a senior horse. Body condition, teeth, joints and overall care they have received during their lifetime determines seniors for me. Our 29 yr old, other than a bit of a sway back starting & a slightly cresty neck (he's a stud, so to be expected) you wouldn't have a clue how old he was by just being around him.