Exer-Swing Gyms are made from transparent clear acrylic with a smoke acrylic tray -- or for $10 extra can be ordered in 6 mix-or-match colors. The 14" or 24" long concrete perches trim nails, are indestructible, big enough for a pair, and provide a sure grip. The tray unsnaps for easy cleaning, and the swing is also ideal in cages without the tray. It is also available with no cups and toys on both sides. Gentle motion and chain climbing provide exceptional exercise, and optional ceiling guards keep birds down low within easy reach. Hang where space for perches is a problem, over computers, sinks, counters -- so your little avian friend can always be hanging near you and happily entertained. Each unit can be custom built to fit any size bird with optional toys and cups. Perch diameters range from 3/4" to 2" to fit the foot size of Parakeets to Macaws.