Take the pull out of dog walking and look good too, using the DNA Double Helix Dog Lead. This dog lead expands and contracts in length depending on the pull exerted by your dog. It is similar in weight, bulk and strength to conventional leads but offers the flexible length benefits associated with existing heavy, bulky expanding leads. The DNA Double Helix Dog Lead has good eye-appeal and was inspired by the double helix structure of the DNA molecule.
The worlds first patent on a DNA structure? 
Patent No GB2264219