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 a supple performance that slides through belay devices and carabiners. Beal's Golden Dry treats the core and the sheath with water resistance, resulting in much less water absorption compared to climbing ropes with only water resistant sheaths.