Size Women's MEDIUM/LARGE (8") Diffuser Bracelet, handcrafted from semi-precious stones, on a semi-stretchy, heavy-duty cord. Pottery Diffuser Beads. All materials have been tested to withstand application of essential oils. Apply 1-2 drops of your favorite Essential Oil to the porous stone of the bracelet. The scent and aromatherapy benefits will last anywhere from 12-48 hours! Happy Diffusing!