The Petzl Mambo 10.1mm Rope is a durable climbing rope for the gym or the crag. The single rope is a 10.1mm diameter that helps with handling. The thick sheath has been built for strength to take on the daily use of the constant climber. Middle marked so you know precisely where the center lies and an UltraSonic finish avoids frayed ends. Someone please invent some type of climbing move and then call it the mambo. After the Latin dance, not at all after this rope.