I love these pensHeavy-duty very solid construction and at 100cm tall they are a great size even for larger breed dogs and terrific for several small-breed puppies.As a registered pedigree dog breeder I also place around my whelping box when I have a litter and actually have 3 now to join together to make a huge play pen for when a large litter are ready to play.I love Crazy Sales delivery times too always so quickVery highly recommended