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This economy-sized package contains three refills for use with FELIWAY Optimum diffusers. The FELIWAY Optimum line represents the next generation of feline behaviour management with improved efficacy and advanced calming messages, helping your cats feel comfortable and secure at home. FELIWAY Optimum is clinically proven to help cats with the management of more signs of stress, such as urine spraying, vertical scratching, excessive hiding, and inter-cat conflicts.