All BuildASofa products are made from 100% Natural wood. We don’t use Plywood (Engineered Hardwood) or Particle Board in our frames! Our closely spaced steel springs are doubled up and tied by hand at the sides for increased strength and so the seats don't sag near the arm. We block and reinforce our arms and legs so they have added durability. Our sofa frames are guaranteed to be free from defects for the life of the sofa.