Wholesale LongLife 90 Day Cat Flea Collar by Hartz The Longlife 90 Day Flea Collar for cats kills fleas and deer ticks which may carry the organism which causes Lyme disease. Protect your cat during the outdoor seasons. To activate collar, just hold the collar at each end and stretch. One collar lasts for 90 days! Don't take a chance with your pet's safety. Do not use on cats under 12 weeks of age. Made in the USA. Each package contains one collar that weighs 0.4 oz. There are 48 collars to a case.