Cat toys that my cat wont eat.

So, my cat will eat pretty much anything. Socks, shoe laces, clothing, plastic bags and most toys.
Any cat toys with a string, feather etc...he will eat it.
Stuffed mouse toys?....He will eat the tail, then chew it open and eat the stuffing.
You get the idea. I am worried he's going to eat a string or stuffing from a toy and end up with a bowel obstruction or something.
Anyways, I want him to have some type of toys so he isnt bored. But I need to find things that he also can't chew apart and swallow. Right now, I have some plastic rattling balls that he can chase around. Everything else I see seems to have stuffing in it, or strings and cords on them. All things I know he will chew open and swallow.
Anyways, any recommendations or ideas for things I can get him to play with that will be safe?