Half Drams - This is about 1/16 of an oz. This is great for trying any of fragrance oils and not investing a ton of money.
Dram Roll Ons - This is about 1/8 of an oz. Perfect for pockets and small purses.
1/3oz Roll Ons - This is the industry standard for personal oil use. This will last approximately 1-2 months of everyday use.
1.3 oz Roll Ons - You love a fragrance get nice large roll ons, do not run out.