Check the listing for details. 1~3 Pack 48ml Feliway Optimum Cat Enhanced Calming Pheromone 3×30 Days Refill. Condition: New, Made in China. Listed at 6.50 USD. ENHANCED SERENITY FOR CATS AND KITTENS: Featuring our patented pheromone discovery¹, FELIWAY Optimum brings the best of feline calming pheromones for improved results². Cat owners reported a 77% reduction in urine spraying, 72% reduction in tension and conflicts, a 73% reduction in scratching, and a 70% reduction in fearful reactions to changes .