Plastic pet door for medium-sized dogs, with installation instructions. I took it out of the box and tried to attach it to the wall, but I realized at that moment that it couldn't be attached to a sliding door, and gave up. Size: Width 28 cm, Height 34 cm Inner window size: Width 23 cm, Height 28 cm - Model: Door for medium-sized dogs - Instruction manual: With installation instructions - Color: White - Material: Plastic - Size: For medium-sized dogs Thank you for looking.