ONE SIZE FITS ALL: Completely adjustable, This cat flea collars is suitable for cats older than 10 weeks and with a neck circumference of 13.8 in or less. Simply adjust the collar to fit the length you need and cut off any remaining length. PROTECT YOUR CATS: Stop the problem at its source. Designed for cats, these water-resistant collars help kill fleas, ticks, flea eggs, and flea larvae for up to 7 months per collar. With the safe breakpoint design can make it your pet easy to get out of trouble. LONG PROTECTION TIME: Each highly durable flea kittens collar gives continuous flea and tick protection for 7 months