This is an incredibly study dog pen. I was surprised how well built this is compared to the one we had that was a similar price. The panels are made of a thick metal and go together so easily. I like that the poles that connect the panels double as the stakes to secure it into the ground - less pieces=less chance of losing anything. Unfortunately the ground in WI is still frozen so we only got to check it out indoors but I can tell it is going to work perfectly for our dogs. Good product.