The 1″ x 1″ perforated square steel tube is a high-quality steel material with a blue powder-coated finish. The tubing is available in standardized pre-cut lengths starting at 6″ and going up to 120″ long and is made from 16 gauge mild steel. The inch on center perforations allow for easy modifications and the ability to repurpose the material for future projects. The tubing forms the framework of every structure in the Flex Craft system and is an essential component. The Flex Craft system is known for its flexibility and ease of use, making it one of the best systems on the market.