Catnip is a plant related to mint and contains an essential oil called nepetalactone that is known to cause euphoric, calming, and relaxing effects on cats. Catnip in small doses is completely safe, non-addictive for your kitten as the effects last about 10 mins for most cats. Fofos Tiny Twin Mouse are a set of 3 cute cat playing toys filled with imported US grade catnip dried leaves and grass powder. These interactive toys allow your cat to chew, swat, nip, play, and even promote harmless biting and scratching. Fun engaging cat toys give your cat a mouse chase-like feeling ensuring good physical stimulation while the catnips give them a calm and relaxing experience. Ideal for small pet kittens above 6 months of age as well as for older cats of Persian and other breeds as well.