The whole set comes in an discreet package with 1 cage, 3 rings, 1 brass built-in lock (with keys), 5 plastic locks, 1 pin, 1 Zipper bag.Our device is made of plastic, perforated design, you can wear if for a long time as it is breathable.There are 2 ways to lock it up.1. You can lock it up with the brass built-in lock,2. You can lock it up with the pin and the plastic lock. ( here you can also use the brass lock, brass lock not be contained, it needs you to buy it separately). It is more convenient to board the plane when you wear it. Measurements:Cage size:• Smaller cage: Length of the inside cage is about 1.3‘‘(33mm),length of outside cage is about 3.15‘‘(80mm)• Standard cage: Length of the inside cage is about 2.28‘‘(58mm),length of outside cage is about 3.82‘‘(97mm)Diameter of the cage is about 1.11‘‘ (28mm).3 ring sizes are available: diameter about 2.52‘‘/2.64‘‘/2.8‘‘ (64mm/67mm/71mm)The distance between the cage and the ring is about 4MM/8MM/12MM.