Optional panel allow for various size configurations. Beautiful hardwood construction.Made from eco-friendly, sustainable Rubberwood. Easy to assemble. This Option Panel is designed exclusively for Richell's Convertible Elite Pet Gate 4-Panel and 6-Panel! DO NOT move panels while caps are on to avoid product damage. 1 1/8" space between wire slats Wire is 7 gage or 0.144" Recommended for small-medium dogs 8.8 to 40 lbs. (4-12kg).