This SAMYO Roll-on bottles are convenient and economical way to dispense essential oil blends. A refillable roll on bottle will allow you to pre-dilute your oil blends so that they can be applied directly to the skin without messy drips or spills. These compact size 10ml cobalt bluebottles feature a stainless steel roller ball and black plastic lids. Feature: 1.Metal ball roller. Get an even oil flow with the high quality metal ball roller. 2.No more stuck rollers or poor oil flow. 3.Our quality roller will deliver the right amount of oil . 4.No more broken bottles in your bag. 5.Set of 8.