Avi One Boing Sisal Rope is designed to provide entertainment and enrichment to your avian bird. Create a stimulating environment by twisting, bending and extending the coil to suit your birds needs. These boing sisal rope perches are thick and durable. Dimensions Small 1.2m x 1.5mm (Small & Medium Birds)Medium 2mm (Medium & Large Birds)Large 3mm (Large & X-Large Birds) Recommended For Small Birds - Parrotlets, Budgerigars, Kakariki, Plum Heads, Cockatiels, Lovebirds, Small Conures (Green Cheek, Brown Throat) and similar sized birds. Medium Birds - Quakers, Senegals, Indian Ringnecks, Port Lincoln, Rainbow Lories, Rosellas, Noble Macaw, Hahns Macaw, Medium Conures (Sun, Janday, Nanday, Blue Crown), Caiques, Pionus and similar sized birds. Large Birds - Amazons (Lilac Crown, Blue Front, Yellow-naped), Timneh African Grey, Alexandrine, Yellow Collar Macaw, Small Cockatoos (Goffins, Major Mitchell, Galah, Lesser Sulphur), Chattering Lori, all Pionus Parrots, Eclectus, Medium Macaws (Severe, Red Fronted), Large Amazons (Double Yellow, Yellow Nape), Umbrella Cockatoos, Congo African Grey and similar sized birds. X-Large Birds - Blue & Gold Macaws, Scarlet Macaws, Moluccan Cockatoos, Sulphur Crested Cockatoos, Hyacinth Macaw, Black Palm Cockatoos, Green Winged Macaws and similar sized birds.