【Size】: The Bead Dia is 8 mm,the girth of the bracelet is 6.3inch~10.6inch/16cm~27cm, and it is adjustable length as you want,perfect fit people's wrists. 【Healing Crystal Bracelet】: These bracelets use real Obsidian stone and lava rock stone, these healing crystal stones are known for their great energy. Obsidian corresponds to the Muladhara in the human body's seven chakras,Wearing obsidian jewelry regularly can effectively remove negative energy from the body, promote new energy, lava rock stone and marble can be clears and purifies negativity. 【Essential Oil Bracelet】: You Can drop your oil on the volcanic stone,the lava stone beads are porous and the volcanic stone beads will absorb the essential oils giving off a scent ,which can lasts a long time and leaves you feeling relaxed and refreshed. 【100% Handcrafted】We use Natural obsidian ,lava and marble balls form a beautiful bracelet,the size of the bracelet beads is about 8MM, 【Shipping & After Sale】 -- Please let us know if you have any problem in purchasing our products, we will solve it in 24 hours. Especially if you have any unsatisfactory of our items, please do not hesitate to contact us, a full refund will be issued to you