What do u call this???

Does any one know what this kind of bottles are called??? I'm trying to hunt some down so i could use them for my DIY serums. If u have any thoughts, please comment below.

And i think i'm abit make up brush obsessed. I bought another Glam eyes brow kit, purely for the make up bag it comes with. Planning to put the MAC travel brushes that is out this holiday season in. And does any one know the price range of Mac Holiday collection brush sets???