10X 100x stainless steel cylinder caps for 18 millimeter / 410 neck size Doterra youth living bottles glass roll-on fragrances perfumes DIN18

Note: The black roller cannot fit some doTERRA bottles. If it is your first purchase, please choose white and transparent rollers. Some essential oils may react with the roller setting, causing increased oil flow or the rolling ball to fall out. Recommended to use with citrus and frankincense essential oils (single or blends). Before each use, please test the rolling ball to ensure it is secure. Please exercise caution with each use. Materials: stainless steel rolling ball and plastic lids for 5 ml to 100 ml bottles (bottle size as shown in the attached picture). Included in the package: 100 pieces × rolling balls and lids. NOTE: doTERRA and Young Living bottles are not included. You are only purchasing the roller insert and cap as a set. The bottle just shows that the insert fits into the bottles. Suggested to buy white rollers and transparent rollers, black rollers may not fit well with some 18 mm bottles. These are roller inserts for large doTERRA bottles. They make applying topical oils soooo easy. The best part is they are reusable. Special note: these rollers do not work with: YL RC oil or any citrus oils or citrus oils in blends. These roller inserts fit doTERRA 5 ml and 15 ml essential oil bottles. Other bottles with an 18 mm mouth are outside this size. If unsure, please try sending me some pictures for confirmation. Convert all your doTERRA oil bottles into roller bottles with these stainless steel or/and glass roller balls. You can use empty oil bottles to make blends or add fractionated coconut oil (FCO) to dilute the oils for your perfect blends.