Natural Flea & Tick Collar for Cats Repels Fleas & Ticks EasyDefense Flea & Tick Collar for Cats uses a powerful combination of cedarwood oil, geranium oil and thyme oil to protect your cat from fleas and ticks. The plant-based, natural active ingredients repel pests for up to 4 months. Just place the breakaway collar around your cat's neck, trim to fit, and let it get to work immediately. Featuring natural active ingredients, this flea and tick collar for cats contains no synthetic pesticides, pyrethrins, phthalates, or artificial fragrances. Dimensions: 13 in L x ¾ cm W