The Titan Chain Dog Training Collars are argon welded and chrome plated for maximum strength and durability. They will not tarnish, rust or break. X Heavy 4.0mm x 22in. Chain dog training collars are safe, effective training tools with proper use. They are not to be used for tie out. Features: *Argon welded and chrome plated for maximum strength and durability *Resists tarnish and rust *Safe and effective training, when used correctly *Not to be used for tie out Applications: Safe, effective dog training tools with proper use..