Solid teak, well engineered, easy to assemble. Mortise and tenon construction, with brass bolts, and threaded brass sockets. Chairs have only four bolts each; and sofa has only six bolts. Span of sofa is reinforced with two extra legs straddling the middle section, but not shown in photo. But some teak oil and rub in a couple of coats.  Cushions are thick. A very good purchase.