Durability is a Sterling hallmark, so the Phenom is constructed to live up to this expectation. Using our higher denier sheath structure, and thermodynamically balanced performance cores, the Phenom is built to last and perform. Featuring a 10.3 mm diameter, this rope hits the sweet spot for handling and gear compatibility. The Phenom is ideal for top rope belays outside, and top rope or lead climbing in today’s modern, high-traffic gyms.