These beaded bracelets are made out of natural lava stone, wood bead, some charm for beauty, and elastic strings that are coated with fabric for maximum comfort and strength. The presence of the lava stone in these can be used as an essential oil diffuser for any lover of good smell. they measure 6 1/4 inch or 15.9 cm. Please note that the beaded charm color may change over time. Bathing or showering with the bracelets are not recommended for longevity proposes of the bracelets.