Size A - Aluminum CLOSED & SPLIT  (2.16mm), Plastic SPLIT Size XF
Small Waxbills and Bicheno (Owl Finches) Finches

Size B - Aluminum CLOSED & SPLIT (2.34mm), Plastic SPLIT Size XF
Cordon Bleu, Fire Finch, Lavender Finch

Size C - Aluminum CLOSED & SPLIT  (2.49mm), Plastic SPLIT Size XF
Gouldian Finch and other small finches, Silverbills, Star Finch, Heck’s Grassfinch,

Zebra Finch, Pictorella, Cherry Finch, Painted Finch, Chestnut Breasted Finch, Red Siskin

Size D - Aluminum CLOSED & SPLIT (2.67mm), Plastic SPLIT Size XF
Green Singing Finch, Cut-Throat Finch, Parrot Finch, Violet Eared Waxbill,

European Goldfinch, Bengalese Finch, other Australian Finches

Size E - Aluminum CLOSED & SPLIT (2.84mm), Plastic SPLIT Size XCS
Gloster, Fife, and miniature Canaries, Blackcap, Greenfinch, Nightingale, Yellow Hammer,

Chaffinch, Bramble Finch, Red Bunting, Diamond Sparrow, Yellow Siskin and all Nuns

Size G - Aluminum CLOSED & SPLIT (3.05mm), Plastic SPLIT Size XCL
Border, Roller, Red Factor, Japanese Hoso, Waterslager, American Singer and Lizard Canaries, Snow Bunting

 Size J - Aluminum CLOSED & SPLIT(3.30mm), Plastic SPLIT Size XCL
Yorkshire, Norwich, Crested and Frill Canaries, Corn Bunting

Size K - Aluminum CLOSED & SPLIT  (3.94mm), Plastic SPLIT Size XB
Java Sparrow, Hawfinch, Shama, Mesia, Pekin Robin, Saffron Finch

Size L - Aluminum CLOSED & SPLIT (4.09mm), Plastic SPLIT Size XB
Budgerigar, Grass Parakeets including Bourkes, Turquoisines, Splendids, Elegants and

Bluewings plus Diamond Dove, Chinese Painted Quail, Button Quail, Parrotlets, Bulbuls

Size M - Aluminum CLOSED & SPLIT (4.34mm), Plastic SPLIT Size X3
Redrumps, Manycolours, Lovebirds, Mistle Thrush, Blackbird, Shrike, Glossy Starlings,

Kakarikis, Lineolated Parakeets, Stanley Rosella, Swift Parrots

Size N - Aluminum CLOSED & SPLIT (5.33mm), Plastic SPLIT Size 1FB
Cockatiels, Mealie & Golden Mantled Rosellas, Pileated Parrot, Plumheaded

Parakeet, Goldie Lorikeet, Lutino & Pied Kakarikis

Size P - Aluminum CLOSED & SPLIT  (5.99mm), Plastic SPLIT Size 1FB
Cloncurry, Pennant, small Quakers, large Quail, Dusky, Peach Fronted, Pyrrhura,

Nanday, Sun, Green Cheeked, & Maroon Bellie Conures,  African Ring Neck,

 Tippler/Tumbler Pigeons & Doves (including Ring Neck)

Size R - Aluminum CLOSED & SPLIT (7.04mm), Plastic SPLIT Size 1FB
Port Lincoln, Twenty-Eight, Blue Headed Pionus, Larger Rosellas, Crimson, Jenday, &

 Blue-Winged Conures, larger Quakers (over 100 grams esp. Myiopsitta monachus monachus), Princess of Wales, Lesser Hill Mynah, Rainbow, Dusky, Blue-Streaked & Violet Necked Lory, Rock Pebbler, Barrabands, Grey Cheeked Parakeet

Size S - Aluminum CLOSED & SPLIT (7.57mm), Plastic SPLIT Size 2FB
Derbyan,  & Patagonian Conure, Homing Pigeon, Australian King Parrot, Moustache Parakeets, Red Lory, Meyer’s Parrot, Hahn’s Macaw, Blue Crowned Pionus, Indian Ringneck Caiques, Senegals*

Size T - Aluminum CLOSED & SPLIT (8.69mm), Plastic SPLIT Size 3FB
Alexandrine Parakeet, Mitred, White Eyed, Red Fronted, White Crowned & Scaly Headed Pionus, White Fronted, Yellow Billed and Tucuman Amazons, Dwarf Macaws, Red Bellied Parrots, Large Lories, Chattering Lories, Cherry Headed Conure, Jardine Parrot, Stella's Lory, Hawk Headed Parrots

Size U - Aluminum CLOSED & SPLIT (9.45mm), Plastic SPLIT Size 4PB
Goffin, Citron Crested, Lesser Sulphur Crested and Rose Breasted Cockatoos, Timneh African Greys, Severe Macaw, White Crowned Turaco

Size V - Aluminum CLOSED & SPLIT (11.00mm),  Plastic SPLIT Size 5PB
Congo African Grey, Medium Sulphur Crested Cockatoos, Mexican Red Headed, Yellow Crowned & Red Lored Amazons, and other large Amazons, All Eclectus

Size W - Aluminum CLOSED & SPLIT (12.70mm), Plastic SPLIT Size 6PB
Triton, Moluccan and Umbrella Cockatoos, Scarlet Macaw, Greater Sulphur Crested Cockatoo, Blue & Gold Macaw, Military Macaw*, Umbrella Cockatoo

Size X - Aluminum CLOSED & SPLIT (14.29mm), Plastic SPLIT Size 7PB
Green Winged and other large Macaws, Leadbeater's, Palm and Sulphur Crested Cockatoos

 Size Y - Aluminum CLOSED & SPLIT (15.98mm), Plastic SPLIT Size 8PB
Hyacinth Macaw