Hartz® Ultra Guard Plus® Topical Flea & Tick Prevention For Cats & Kittens Monthly Treatments. Use only on cats and kittens 5 lbs and over & 12 weeks of age and older. Kills: Fleas. Deer ticks. Flea eggs. Repels: Mosquitoes. Easy to use applicator. 3 monthly treatments. Starts killing fleas within 15 minutes. Contains 3 tubes, each 0.061 fl oz (1.8 ml). Net contents: 0.183 fl oz (5.4 ml). Convenient easy to use applicator. Hartz® and other trademarks are trademarks of The Hartz Mountain Corporation.