The Titan Extra-Heavy Training Collar is an ultra-strong choke chain intended for very large dogs and tough pullers. It is constructed from robust 4 mm chrome-plated steel links that provide maximum strength and even pressure when a correction is given. Like all Titan chain collars, it has welded, smooth links to ensure reliable performance and longevity. This collar is ideal for training giant breeds in obedience and leash manners (only for supervised use; not for continuous wear or tie-out). Available in Multiple Sizes