STAINLESS STEEL ROLLERBALLS FOR 5ML, 10ML, 15ML, 20ML, 30ML, 50ML AND 100ML BOTTLES WITH LIDS **Stainless steel roller ball inserts that fit standard size (Boston Round) 5ml and 15ml essential oil amber bottles! Now, you can turn your doTerra and Young Living oil bottles into roller bottles with these stainless steel rollerballs. You can use your used oil bottles to make blends and add carrier oils to dilute oils that you don't want to use full strength. Now you don't have to waste your essential oil bottles! Turn them into roller bottles and share with your family and friends! To use simply place the rollerball in the bottle opening and press firmly until is snaps in place. Add the cap and you are go to go! DETAILS 12 Rollerball Inserts and 12 Caps Stainless Steel Roller Ball Fits Amber Bottles 5ml - 100ml Reuse your old oil bottles from doTerra and Young Living. This is a Got Oil Supplies Branded Listing.