GoGo Pet Products High Epoxy Exercise Pen with Door for Dogs, 24-Inch, Black Thick wire gauge 6,7 (frame) & 11. The smaller the number the thicker the wire. Unique metal tabs for an extra secure door. Removable pin allows you to add additional pens for added play space. No exposed screws, wires or pins. Suitcase style folding for easy transport. Free outdoor grass anchors. Read our reviews. Thick wire gauge 6,7 (frame) and 11. The smaller the number the thicker the wire Unique metal tabs for an extra secure door Removable pin allows you to add additional pens for added play space No exposed screws, wires or pins. Suitcase style folding for easy transport Free outdoor grass anchors. Read our reviews