The 9.8mm Evolution Velocity Dynamic Rope by Sterling is part of their Evolution Series of ropes. This is a rope that is lightweight, but can take multiple impact forces with high fall ratings. Bottom line, a light rope that can take a heck of a beating for an extended period of time. The Velocity has been constructed with a new sheath and core construction giving you an incredibly durable rope with half the weight of a higher diameter. The Velocity also excels at zero drag over rock and caribiners, and clips with enough stiffness, you can be assured you wont get that classic rope flop. All in all, the Velocity is the perfect rope for onsights, redpoints or long routes where you need a rope that can glide over surfaces without getting caught and will clip like a dream.