Lock them safely in to your heart by placing this collar around their neck and turning the key! This PU leather collar has a nickel-free, heart-shaped lock at the center that not only creates a pleasing aesthetic for the wearer, it functions as a lock, too! Simply take one of the two included keys and turn them into the hole at the center of the lock to lock up or release the wearer from their collar. The PU leather collar comes in black and the nickel-free metal is a shiny silver. The inner lining of the collar is soft to avoid chafing of the neck. Includes 2 keys. Measurements : Overall length: 19.25 inches, Strap width: 1 inch, Adjusts from 13.5 inch to 16.5 inch circumference Materials : PU leather, metal Color : Black, silver