Hello Jen;
Thank you for contacting us with your questions. The Rattler Ring is sized more for medium to some large birds. The tube is not real thick, approximately ¾ inch diameter. We would guess that it is probably not suitable for your bird.
We understand the challenges presented by Hyacinth Macaws. They are so beautiful, but active and strong birds. Our best recommendation for foot toys would be to visit our sister site www.makeyourownbirdtoys.com for lots of fun options to make things for your bird.
Specific items that you might like include:
Birdie Bagels, especially Macaw Bagels and Fatty Bagels http://makeyourownbirdtoys.com/Bagels-Tubes.html, These are fun to hold, play with, and shred.
Acrylic Toy Bases and PVC crosses http://makeyourownbirdtoys.com/Plastic-Bird-Toy-Bases.html; These are fun to beak, and hold and manipulate by big birds.
Large 28mm Plastic Beads http://makeyourownbirdtoys.com/28mm-Plastic-Bead_p_298.html, and Mega Beads http://makeyourownbirdtoys.com/Mega-Beads_p_121.html; and perhaps the Puzzle Cube http://makeyourownbirdtoys.com/Puzzle-Cube_p_148.html. The beads could be tied onto the acrylic bases by Paulie Rope http://makeyourownbirdtoys.com/Paulie-Rope_p_42.html .
We also offer a variety of wood toy parts if your bird loves to shred: http://makeyourownbirdtoys.com/Wood-Bird-Toy-Parts.html
Hopefully this helps with some ideas, and we would love feedback on how your Hyacinth likes things. Thanks again for writing, if we can be of further assistance please let us know!