Size Women's MEDIUM (7.5") Diffuser Bracelet, handcrafted from Emerald Green/White/Copper beads with gold accent, on a semi-stretchy, heavy-duty cord. 10mm Black Lava Bead Diffuser Bead. These beads hold the oils' scent and therapeutic aroma exceptionally well! 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!