Benefit from natures most powerful plants with this unique blend of cedar wood and peppermint oils formulated to repel fleas and ticks. This proven effective collar is made with plant-based ingredients and infused with carbon to provide up to 4 months of protection. Its water resistant, comfortable and durable. Contains no Phthalates or PVC. For dogs and puppies up to 4 months or older. Adjustable up to 20.