One-piece design: no buckle or clip, only one slider to adjust the harness. Automatic adjustment of the elastic traction cord:When the bird crawls and flies, it automatically adjusts from the chest to the back, the effective pull rope design can reduce the pressure contact points of the birds. Required:This parrot leash is a must have for birds who like to take birds out. HIGH QUALITY MATERIAL:The pull cable is made of sturdy nylon webbing that is rubbery and bite resistant. Adjust the taste of life: you only need a little patience and a lot of food, almost any bird can train to carry it.Add life to the fun. Size reference: XS: head length is 5.5cm, height from head to body is 5cm.The total length of the rope is 120 cm. S:Head length is 6.5cm, height from head to body is 6.8cm.The total length of the rope is 120 cm. M:Head length is 7.5cm, height from head to body is 8cm.The total length of the rope is 130cm. L:Head length is 9cm, height from head to body is 10cm.The total length of