This bridge is made from both balsa and bass woods. The bridge is mainly finished. Just a little more detail, and a few more decking boards on top. I added a background picture just for taking these pictures. I have another picture I put behind it for normal use that is not to scale but is a cloth curtain for the window. My wife says this is the 5 year bridge. I worked on it for almost five years but only a little bit at a time and still needs a few little details. Once a 14lb cat walked acrossed it and I had to replace a few peices but it was mainly OK.