Vision Bird Cage Perch, Green Ergonomically designed vision perch feature a unique multi-grip surface Promotes foot circulation and helps prevent foot problems in birds Designed to be accessed from the exterior, a non-invasive approach that reduces stress Installation is easy, simply insert the perch between two cage bars and rotate 90 degrees to lock in place Measures 1-3/5-inch length by 13-4/5-inch height by 6-inch width