Ruff Wear Knot-A-Coupler Walk Multiple Dogs at the Same Time! Dynamicord stretch rope absorbs shock for comfort and safety Freewheeling swivels reduce twists and tangles for total flexibility E-Z Clip leash attachment quickly clips to collars for speedy dog wrangling Reflective trim woven into the coupler improves visibility and safety in low light Link multiple Knot-a-Couplers to walk more dogs (3, 4, or more)