Living World Adjustable Green Harness and Lead Set for Ferrets. The Living World Adjustable Harness and Lead Set for Ferrets is made of safe, comfortable and durable nylon material. The color-coordinated set is custom designed to comfortably fit your ferret. The adjustment slides allow quick, customized fitting. The harness is easy to use and has a quick release feature. Green, 8 mm (0.3 in) wide x 13 - 20 cm (5.5 - 7.9 in) neck, 14 - 21 cm (5.5 - 8.2 in) body, adjustable 1.2 m (4 ft) lead. Available in 2 colours: Red & Green