These bracelets are made of tigers eye and volcanic stone. 
The bead diameter is 8mm. 
The bracelet is stretchable (7 inches to 8.5 inches), suitable for most wrists
 Tiger eye stone represents bravery, self-confidence and strength. Tiger eye bracelet can inspire courage and increase confidence. 
Black agate brings calm and relieves worries. 
The lava bracelet can also be used as an essential oil diffuser. 
Please specify if there is a specific bracelet you would like if not one will be intuitively chosen for you.