These bracelets are made using black lava stones.  The lava stones absorb the Essential Oil. Any brand of Essential Oil can be used on the stones.  The Essential Oil is put directly onto the bracelet and will last on the beads for a few days.  Then choose to put a new oil on the bracelet or use the same oil again, take Essential Oil with you all day!  Good to help reduce anxiety/stress, headaches, promote sleep and so much more.  These bracelets are available in adult and kid sizes.  SIZING: Bracelets start at 7.25 inches for adults. They can be made bigger or smaller, just send a message and let me know and we can talk about sizing. Kids sizes start at 6 inches, they can be made smaller if needed too.