If you have teenage children who are prone to punching holes in doors or domestic pets that are prone to stampeding through doors, these doors are probably not for you. They are made of a manufactured product called "hardboard." It is not as strong as solid wood or steel and the back of it is unfinished but for me I could care less because I'll never look at the back of my closet door and potential home buyers probably will not either. These doors were delivered to my home undamaged. They were easy to install and easy to paint. They look great and they glide back and forth on the railing very smoothly.