I've created a height-adjustable perch component (perch not included) to help young or elderly birds. It's easy to install and designed to fit most commercially available cages. The height is adjustable in 5 steps (see photos for detailed adjustment sizes). ＜Main Mounting Dimensions＞ ・Wire diameter: 1.0-1.8mm ・Wire spacing: 9mm or more ・Perch diameter: 15mm or less Size: 120mm x 30mm Material: PLA resin (plant-based plastic, so it's safe to use)