Most listings show metal (usually steel) frames and plastic panels. Common plastics named are HDPE or polyethylene, with metal/steel used for frames and plastic panels used for the playpen sections.
Common options include freestanding panels and pressure- or tension-style mounts for indoor use. Many plastic playpens add suction cups for indoor placement, while outdoor setups commonly use stakes or ground anchors to secure panels.
Most listings target small to medium-sized dogs and puppies. Some products also note suitability for other small pets such as cats and rabbits.
Assembly is generally straightforward: many items advertise quick, tool-free or simple connector assembly. Some listings specify adult assembly and note that basic tools are provided when required.
Heights commonly range from about 24 inches up to 40 inches. Example listing heights include 24", 30", 31.7", and 32" depending on the model.
Many listings describe these gates and playpens as portable and lightweight, suitable for both indoor and outdoor use. Indoor stability features often include suction cups or anti-slip pads; outdoor setups commonly add ground or metal stakes for anchoring. Panels are often removable for easier storage and transport.