Our Chakra bracelet is made with black lava stone (volcanic rock), which is porous. This is recommended for use with essential oils as the pores in the lava stone absorbs the oil. The bracelet is made with agate stone, fire agate, aventurine, howlite, glass and quartzite, and lavastone. It is made with 10mm size beads and base metal spacers in small or standard size, which is typically recommended for size 5-6 wrists, men or women. Made with our standard double stranding method, which helps with the integrity of the bracelet. Expect superior craftsmanship and above average tension in this piece.