Well, the big thing is no harnesses/leeshes, and no exercise wheels or balls. Both can cause serious back issues, I'm convinced you know this already, but new members reading the thread may not
Anything that they can get their heads stuck in, and toys with sharp edges. I know I'm not being very specific about brands.
Some loofa toys are sold in a ring-shape and have been found to be a hazard, but cutting them in half solves this.
Toilet rolls are considered safe BUT many members would advise to cut it lengthways so that any pig poking their heads into it cannot get stuck. I always feel better about cutting mine.
I thoroughly recommend against any tubes that are 10-11 cm in diameter. Many of these will be advertised as suitable for pigs, but honestly they are only suitable for babies. Last time I introduced a baby I placed a 10cm wide plastic bendy tube in the introduction pen, for a safe place to go for the baby should she feel threatened, thinking no other pig would even try to follow her. I was wrong, and one of my smaller adult pigs got completely stuck in there. I had to literally cut her free.
Really tubes should be at least 16 cm wide for most adult pigs to run through comfortably, in my experience anyhow
Hidies with straw or wooden bottoms are lovely at first but can get manky quickly. If you cannot cut the bottom off these you end up wasting your money quickly. Not a safety issue though unless you leave a manky thing in the cage for ages!
The golden rules are:
1) It should be safe/non toxic to gnaw
2) Large enough for a pig to fit it's entire body through easily, or have gaps small enough for all the pigs to not squeeze more than their noses through
3) Should have smooth edges, nothing sharp
4) If it's to be walked on should have a comfortable surface, and one that can be cleaned.
Sorry no brands, but I hope it helps you to judge
