Re: plastic “0” rings on play tubes
Bits of plastic that come off when it is chewed can be sharp, and I've heard it said that they can cause internal damage to rodents. Plastic also isn't degradable when swallowed like paper and, to some extent, wood is. While I haven't actually heard of any confirmed cases of injury or death of rodents from chewing plastic, if you are worried about it, it is probably better to stick to wooden accessories if only for your own peace of mind. Wooden accessories will also generally last longer, and don't look as ugly when chewed as plastic things tend to.
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