Aspenpet® Mighty Link® collars are created with nickel and chrome plating for durability. Be sure to keep in mind the weight of the chain in comparison to the size of your dog as a heavy chain will cause smaller dogs to tire quickly. Choose the perfect length by adding 2 to 3 in to the circumference of your furry friend's neck. To be sure the collar is on correctly, allow the collar to hang down. When looking at your dog, the collar should form a P shape. Available in a variety of lengths and thicknesses, this collar serves as a great training aid.