Material : S925 silver Size: Ring wall width 7.6MM. Weight 3.93-4.08 g No.9: Default inner diameter size 15.1 MM, finger circumference 49 MM, ring opening adjustable width. No.13: Default inner diameter size 16.5 MM, finger circumference 53 MM, ring opening adjustable width. No.17: Default inner diameter size 17.9 MM, finger circumference 57/58 MM, ring opening adjustable width. PS: Wearing attention to acid and alkali sweat perfume chemicals will corrode the material. Replenishment: 10-15 days. Payment method:Paypal transfer :An0x1a Shipping Address:China