KONG refillable catnip toys utilize top quality natural North American catnip.
These toys have a special compartment that can be opened and closed so that fresh catnip can be added again and again--to last all your cats' nine lives.
Catnip is a natural non-addicting herb that encourages play in about 70% of cats who have an inherited gene that compels them to respond to catnip.
For utmost kitty enjoyment gently twist the filled toy to release catnips' herbal oils.
To maintain maximum freshness freeze extra catnip until needed.