We use only top quality utilized natural north American catnip for Gigwi refillable catnip toys. these toys have a special fastener, so that fresh catnip teabags can be added again and again – to last all your cats nine lives. catnip is a natural, non-addicting herb that encourages playful behaviour for about 70% of cats, which have an inherited gene that compels them to respond to catnip.