BETA¹ ring is a unisex design that can be adjusted to the wearer's finger. Measurements: 3mm wide, 0.5mm thick, comes with engraved "aka jewellery" logo and rings number Smaller(S) ranges from 5 to 8 US sizes, 15.5 to 18mm inside diameter, Bigger (M) 8 -to 11 US sizes, 18 to 20mm inside diameter. if you need any size out of the range, please leave a comment at the checkout window or email us at info@akajewellery.com Made in silver or 14K white gold.