Replacement Roller Tops for Roll-On Bottles with Stainless Steel Metal Balls (12) - Fits Roll On Bottles with a .63 in / 16 mm Inner Neck.

IMPORTANT: DO NOT USE METAL ROLLERBALLS WITH FRACTIONATED COCONUT OIL OR BLENDS THERE OF. These Stainless Steel Rollers are perfect for PURE and UNDILUTED essential oils. However if youre using Fractionated Coconut Oil to dilute or blend with other oils, the metal ball may pop out since Fractionated Coconut Oil acts as a Metal Lubricant and will loosen the roller balls