Just like the solid Velocity this 9.8mm rope has it all and is our most popular of the Evolution series. Just the right amount of stiffness, so your rope doesnt flop during critical clips and its silky smooth sheath withstands abrasion and slides effortlessly to reduce rope drag. What makes Sterlings BiColor ropes unique and a leader in industry is the dramatic color change in the middle. Finding the center is easy, quick and accurate, even in low light situations. These ropes have the same construction and award winning performance as their single color namesakes.