Titan brand Pet Exercise Pen by Majestic Pet Products is great for use at home, travel, or shows. This exercise pen is made of 9 & 11 gauge wire with a titanium zinc-plated finish and has a secure, double latch door within a panel, for easy step through access. You have the flexibility to arrange this pen in the shape of choice or even buy two exercise pens and hook them together to make a larger exercise pen. It can also be attached to a dog crate for a complete kennel solution.Easy assembly - just unfold and hook together.Easy to carry - just fold it flat!Sizing Rule of Thumb: Choose a pen that is at least 4 inches taller than the top of your dog's head.