The twist Nozzle Cap can be used for many applications. It is perfect for your hair treatment line. It can be used for your hair serum or hair oil, allowing users to apply the treatment directly to the hair. Ideal for hair masks, conditioners and other hair therapy treatments. You can use it to fill your little sample packs, wether you are filling our little vials, tijen pumps or serum ampoules, no more messing around. Just swap the cap of the bottle of your product with this one and you can fill up your sample packs!