Invis-A-Rail developed its infill railing system as a less-expensive, less-complicated alternative to cable railing. The design consists of two main components: a pair of anodized aluminum support channels that come in 6-foot or 8-foot lengths, and vertical 304-grade stainless steel rods with hooked ends. The vertical rods are inserted into slots spaced 3 inches on-center in the channels, and the channels are screwed to structural upper and lower rails to create each rail section. A 10-pack of 30-inch balusters costs $60, while a 6-foot-support- channel kit costs $50.