Ever seen a 7 or 8mm thick rope? These are twin ropes or half ropes meant for a very specific type of rock climbing. Not for regular sport climbing!
Gear Guide: What the Heck are Twin and Half Ropes?
One Rope or Two: When to Use Half Ropes
The 5 Belay Device Types Explained - WeighMyRack
Rope Types Explained - WeighMyRack
Half Ropes (Double Ropes) - How To Lead and Belay - VDiff Climbing
Ice • Moja Gear
Rock Climbing Rope and Cords
Choosing the Right Climbing Rope Diameter
gear - Difference when using twin or half ropes - The Great Outdoors Stack Exchange
Rock Climbing Rope and Cords