A generic cap and septum are the ones you can buy at your local lab supply store. Or from vwr.com in their general catolog under 'vials' then 'caps'. You can't buy a cap that says Ttokkyo or ones that have Brovel Laboratories in raised letters in the aluminum cap. That is why once upon a time Brovel could be counted on to be real (it can't now). A good example is Maxigan. You could buy a real bottle of Maxigan with the hologram from Mexico. When you are done using it, cut off the cap & septum. Fill it with cottonseed oil, crimp on a new cap and septum and sell it for $250. Ttokkyo and Denkall have original caps that you can't order off the internet.