If you would like extra felt pads, the 22.5mm size is the insert size. You can purchase here.
How to Use: Remove the pad from the slap bracelet. Add 1-2 drops of your favorite essential oil (or 1 drop of a few different oils to make a custom blend) to the reusable felt pad. It does not have to be saturated to enjoy the benefits. Reassemble and take your aromatherapy on the go!