Mr Slobberchops Natural Flea & Tick Collar is a plant-based formula gets to work to effectively manage pests including: ticks, lice, larvae and mosquitoes. The Flea & Tick Collars last for about 8 months use once opened. The collar uses a controlled release of gentle, yet active ingredients for flea & tick prevention in dogs. Waterproof & adjustable, available in Standard size (62cm long, 1.3 cm wide) Ingredients: Lemongrass Oil 3%, Eucalyptus Oil 3%, Peppermint Oil 3%, Lavender Oil 1%. For Use on dogs over 12 weeks.