These beads feature a champagne color crystal bead, a wooden bead and a black lava bead for using essential oils. The lava beads are porous with “craters” on them. You can drop one drop of oil on each bead and it will last 2-3 days. Apply straight from bottle or with a qtip and rub oil on the bead. Perfect for a healthier alternative instead of wearing chemical perfumes. After 2 or 3 days, the aromatherapy on the lava will start to fade. You can use more oil on them and any kind you’d like. There are certain oils that will last as long or longer than 7 days. You can reapply oils as often as you prefer and any oil that you like.