I give one to Salty 1 or 2X a year. He destroys them. I see small scraps of rubber and cloth on the floor, so I assume he is not eating them. But not safe to assume your parrot will not chow down on them.
And then you have where in this huge World they are manufactured!! As very few places in this World have the controls in place to minimize the use of Hazards Chemicals.
There are more than enough natural stuff that Julio can turn into tiny bits, willing!! I see no reason to buy neat stuff, which I have zero trust in the sourcing.
For me, its a Red Flag Item and No Julio does not get the chance to turn those into tiny bits. Plus, with his active mind, it a simple step to move-up to the big size thing that looks the same!
Lucy had those shoes and she mostly liked to SLAM them around her cage. She didn’t chew them up. And shoes were her special love. So I left them with her.
Had I seen any rubber getting nibbled I would have taken them away. She really just liked to stomp.