Made with EM beads, which are composed of cooked clays to which effective microorganisms have been added through an air-protected cooking process. Ceramic beads disrupt tick receptors, which prevents the tick from detecting the animal. Thanks to their tube shape, which transmits a resonance by vibration that therefore destabilizes ticks. To (re) activate the pearls, simply wet them and let them dry to regenerate the pearls for 10-15 days. Why wooden beads? Wood absorbs very easily, so we can put essential oils into it to fight against fleas, flies and mosquitoes. Do not hesitate to contact us for other colors and/or specify the color in comments As well as the exact size of the neck