Marukan natural fragrance octopus for cats has a Sliver vine centre for the scent and the taste, a natural wood body for durability and genuine strings for tugging and biting. Silver vine (also known as Matatabi) has been known to elicit a euphoric response in cats much more intense than catnip. One in three cats (about 33%)does not react to catnips, while 80% of the cats positively react to Silver Vine. Thus making Silver Vine a great alternative to catnip. A study by the University of Illinois has shown that cats played two and a half times longer with the toys associated with Matatabi/Silvervine than those sprinkled with regular catnip.