Silvervine is a herb that’s grown in the mountains of Japan and China.
It's not related to the catnip family, but produces similar results in cats: a feeling of euphoria and happiness.
Not all cats react to catnip, those that don't may prefer Silvervine instead (though not all cats will react to Silvervine either).
Cats play with the sticks like toys and will often chew on them too and this is said to be good for their teeth. Some people also find them helpful when kittens are teething as something for them to chew on to help through that phase.
Please note that this is a natural product so the exact size/width of each stick will vary - some are quite narrow, others a bit thicker. They may not be exactly straight either :)
We also have concentrated Silvervine Powder in our store, subject to stock availability.