The cables are comprised of multiple optical fibers bundled together in a flat ribbon format that is high density, lightweight, and durable for easy handling and installations in tight spaces and extreme environmental conditions. In recent years, this design has also emerged as a major choice for building backbones where riser and plenum flame ratings are required. Installation and handling have never been easier with fiber counts reaching up to 6,912 in an incredibly compact design. Known colloquially as Intermittently Bonded Ribbon (IBR). The ultimate fiber cabling solution for the highest bandwidth capacity in duct, buried or aerial applications.