Description:21mm flet pads is for 25mm locketsUsing for superior quality felts, through cold chipping process. Compact structure and regular shape. High oil absorbability, washable and reusableCan often be pressed into smaller chambers as well. Just add a few drops of your favorite and enjoy that scent throughout the day.Whether you're looking for calming, or uplifting scents - you choose the oil. Works with perfumes as well. Let your favorite essential oil flavor to accompany you longer.Great accessories for diffuser necklace, essential oil car diffuser vent clip, diffuser pendant, etc.Perfect for DIY diffuser jewelry for you, your family or your friendsSpecification:Material: FeltDiameter: Approx. 21mm / 0.83 inchThickness: Approx. 3mm/ 0.12 inchPackage Includes:200 Pieces Aromatherapy Essential Oil Diffuser Locket Refill Pads