COLISEUM I Pergola. High-quality hardware fittings. Detailed craftsmanship to the contoured roof ends & carved posts. Environmentally friendly & harvested from certified forests. Natural oils in the wood act as preservatives to resist insect attack & decay. Careful attention to form & proportion. No need to spend additional money on post mounts, because the pergola comes with four free steel bases, which are optional but an elegant and unique addition to the backyard. Product dimension: 1.