The Wacky Walk'r X'tension is designed to turn your retractable leash into a NO PULL retractable leash.  Just attach the Xtension to the end of your current retractable or standard leash and you'll feel the difference while experiencing some of the many benefits that Wacky Walk'r provides.  The Xtension is a great option for those times when your pet needs to be on a retractable leash or you can't use your full size Wacky Walk'r leash.