Featherland Paradise made the Square Grass Stacks for small to medium-sized birds. Because we know birds love to chew, we sandwiched woven grass mats with colorful wood slats on a stainless steel wire, between 2 wooden blocks. We included a quick link that will attach the toy to virtually any cage. The soft Canadian pinewood is colored with food dye and safe, natural grass fibers. Parrots will love chewing this destructible toy, so put one in your birdcage today!