Product Package content: 1xdog chain1.Size: S: chain diameter: 3mm, length: 55cm M: chain diameter: 3.5mm, length: 60cm L: chain diameter: 4mm, length: 65cm.2.Material: iron. Silver color. The dog collar is very strong, suitable for large dogs or live dogs, such as: Alaska, Golden Retriever, Husky, etc.3.Working Principle: When using the control collar, when the dog is violent or excited, the collar will tighten, and the dog will not be out of control if he feels uncomfortable.4.After careful polishing and fine grinding, the dog collar has a smooth surface and does not cut the dog's hair.5.HOW TO USE: The necklace is composed of a chain and 2 identical O-shaped rings at the ends of the chain, its use is a little different from the classic necklace. Attach one of the rings to a leash, with the remaining ring, insert the chain in this ring, then slide it to give you a slipknot, pass the chain around your pet's neck. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.