UPTs are designed for high energy dogs which tend to lose, or wear out, normal pet tags. UPTs are super strong because the tag material is far thicker than normal tags, so it will perhaps never wear through.
Also, the link used to attach the tag to the collar is made of a solid, thick stainless steel triangle rather than a split ring, which sooner or later will wear out when attached to highly energetic dogs. Why buy a new pet tag every 18 months when you can have one that lasts the life of the pet?
UPT's are available from my shop on Etsy: Metal Products for People & Pets by ThamesMetalDesigns on Etsy