Long acting protection Preventef offers protection from fleas and ticks for 5 months Contains EFAs EFAs promote a healthy coat and assist in the action of the insecticide Safe The Preventef Collars can even be used on kittens and puppies from 12 weeks of age. Ease of use / Low cost Preventef is easy to use and inexpensive. Slow release of the active ingredients Guarantee of efficacy for 5 months. Water resistant After a swim or bath, the collar will continue to release its active ingredients to protect your pet. Virbac Guarantee This product carries the Virbac Guarantee. This guarantee states that if this product has not met expectations of users within the claims made on the registered label, that Virbac guarantees to replace the product, provide an alternative product or refund the purchase price. Price Competitive Virbac prides itself as a company providing cost effective animal remedies. This means that you as a Virbac customer can be assured of value for money.