Size Reference (approx) (1cm = 0.39in): S: Head length is 6.5cm, head to body height is 6.8cm. The elastic band is 156cm long and 1.5mm in diameter. The length of the nylon rope is 46cm, the width is 1cm, the total length of the rope is 120cm; the weight is 59g; the parrot reference: 110-190g M: Head length is 7.5cm, head to body height is 8cm. The elastic band is 137cm long and 2.5mm in diameter. The length of the nylon rope is 52cm, the width is 1.1cm, the total length of the rope is 120cm; the weight is 59g; the parrot reference: 190-420g L: Head length is 9cm, head to body height is 10cm. The elastic rubber band is 199cm long and the diameter is 2.5mm. The length of the nylon rope is 62cm, the width is 1.1cm, the total length of the rope is 120cm, and the weight is 60g, the parrot reference: 425-600g. One-piece design: no buckle or clip, only one slider to adjust the harness. Automatic Elastic Pull Rope Adjustment: When the bird crawls and flies, it automatically adapts from the chest to the back, the effective pull rope design can reduce the pressure contact points of the birds. Mandatory: This parrot leash is a must have for birds who like to take birds out. HIGH QUALITY MATERIAL: The pull cable is made of a sturdy nylon webbing which 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 wear it. Add life to the fun.