Most listings show a closed footprint of 52 in × 52 in with a height of 32 in. Some listings also show an expanded or open configuration that extends to about 104 in.
Listings list metal materials such as steel or iron, often with a powder‑coated or other treated surface to resist rust and wear.
All require adult assembly. Tool inclusion varies by listing: some provide the necessary tools, some do not, and a few note only some tools are provided.
Many listings describe the pens as foldable or disassemblable into a flat, compact form for easier carrying, storage, and travel.
Listings mention a gravity‑action door lock and ground stakes with rounded ball tips to help secure the pen and reduce the risk of pet injury.
The pens are designed for DIY layouts: panels can be arranged into square, rectangular, round (curved) or other configurations, and panels can be added or removed to change the enclosed area.