This new spiral staircase line is designed to work in tandem with other pre-existing Trex decking and railing systems to create one system. A lip-up tread design ensures space between the risers does not exceed 4 inches. The staircases are also compatible with the LED-dimmable Trex DeckLighting system for added style and safety. Galvanized steel and aluminum models are offered in addition to the traditional composite option. A total of 12 customizable options are available.