These copper pipe fittings can be purchased at most any hardware or plumbing supply store. Each curved piece has one smaller end that slides into one opening in the t-shaped fitting. You can simply glue the fittings together using an adhesive recommended by the clerk. I wanted a flush seam, so I glued a smaller, tubular fitting inside each opening and butted the seams together. I could have polished them up to a bright, copper shine, but I chose to give them a weathered, verdigris finish by applying Patina Green, an oxidizing agent I purchased at an art store.