Our dog leashes are not only highly durable, but they feature sturdy hardware that hold tight, even with heavier dogs. Our rock-climbers, aviation aluminum carabiners can handle up to 850 lbs of force! 2.34 mm stainless steel braided wire cable includes 5 bundles of 7 wires for extreme strength. Aviation aluminum carabiner holds 850+ lbs of max force tension and is the same clip that rock climbers trust with their lives. Padded handle for added comfort during long walks.