Modern Design Wood Beam Mono Stairs In the past, if you wanted a modern Steel Mono Stringer, you basically had 2 options to choose from: 1. The steel mono stringer – Single Stringer Steel Stairs offers industrial and modern style through its steel stringer support system and exposed hardware and joints. 2. The plywood box mono stringer – Wood Mono Stringer Stairs meets the requirements of a mono with the warmth of wood. However, it is very simplistic and limits opportunity for design. Our design team for Modern Stairs saw a stylistic gap between these 2 options and developed a signature mono Solid Wood Stairs to bring another design to the market.