The O-Flex has a high tech core specially designed for indoor climbers. The core cables are wound together in a helix pattern to form a core that retains the ropes roundness better than traditional climbing ropes. This is important to rope longevity in indoor climbing environments where top-rope is the norm. Super smooth HD sheath weave reduces rope drag and increases rope life in gyms. Three colors to help rotation in 10.2mm. Pre cut 30m option.