The Marco Polo tag slips into a ballistic-nylon cloth holder that attaches to your pet’s collar or harness with 4 Velcro straps. The Velcro used is a military grade material that holds with 100 lbs. strength per strap, yet has a soft nylon backing that is comfortable for your pet. When mounted in the collar holder, the tag electronics are well protected and look new, even after years of rough use. When needed, the cloth holder can be economically replaced (see the Accessories page) and can also be machine washed.