The EM ceramic anti-tick dog collar is an excellent alternative to keep ticks away from your pet. Having been tested for years, you will be surprised by its effectiveness. Adjustable Uni Collection Adjustable attachment, very easy to adjust to your dog's size. Collar width 1cm, don't forget to give me your dog's name if you want to add it! It is 100% natural, I make it in several sizes with a ceramic every 2cm for optimal efficiency! You can write your dog's name at the end of your order (comments box in the shopping cart). - What is EM ceramic? EM ceramics is a Japanese discovery; it comes in the form of a small bead cut into a pipe shape. It is composed of clay to which Effective Microorganisms (EM) have been added during anaerobic firing (in the absence of air). This cooking method allows the EM to fix themselves in the clay and to last. These microorganisms activate upon contact with water and transmit vibrations, magnetic resonances, which disrupt the tick's receptors, preventing it from detecting the dog. -Instructions: To restore the beads, simply rinse them under water and let the necklace dry in the sun. This will restore the beads to their maximum effectiveness. If you would like a different cord color, please let me know when placing your order. Brand: LaissedeWouf