Michelle Queen Aromatherapy Necklace Locket Diffuser Refill Pads for Essential Oils Pack of 100,20mm,10 Colors Mixed 100% Polyester Felt Fabric 100-Pieces Pack of high quality replacement pads for your aromatherapy diffuser locket or necklace. 20mm diameter - Fits many different brands and styles of diffuser necklace Use in any scent chamber with 20mm or greater diameter to gradually diffuse your essential oils. Simply replace pad when it loses absorbency or when you wish to change scents