Weighing in at 48 grams per meter, BEAL's Opera Golden Dry Climbing Rope is the lightest single rope as well as the skinniest. Certified as a half, twin, or single, the Opera's 8. 5mm diameter provides the ultimate versatility specifically designed for high-level climbers from sport senders to ice mountaineers. A Unicore construction bonds the sheath to the core for better abrasion-resistance, slippage elimination, and supple performance that glides through our belay devices and carabiners. BEAL's Golden Dry treats the core and the sheath for through-and-through water-resistance.