Flea and Tick Prevention for Cats, Natural Flea and Tick collar for Cats, One Size Fits All, 13 inch, 8 MONTH PROTECTION, Charity FRESH AND CLEAN  Our flea and tick repellent collar for cats is made with natural oils and plant extracts and does not contain any toxic chemicals. Environmentally friendly and hypoallergenic. 100% safe for pets, humans, and the Swiss Alps.