So many possibilities with these special roller ball bottles! These bottles are filled with your choice of gemstones, then, you fill it up with the essential and carrier oils of your choice. You can make crystal infused perfumes, or specific scents for your ritual workings. There's no limit to the combinations you can make. These are 1/3 oz roller bottle filled 3/4 of the way with your choice of crystal. Just add your own oil.