Our Hollow Wood Beams (Boxed Beams) - Each timber is one-of-a-kind, with unique, often extreme characteristics from its prior use (pockets, wear, notches, holes, texture, etc.) and from weathering. Hand-Hewn timbers are generally seasoned and are more stable and less prone to shrinkage than are green timbers. Hand-Hewn timbers are typically stored outside. Species: Oak, Chestnut, Pine, Hemlock, Ash and Poplar.