Replaces a 10-sided die (d10)Our rings are wider than most so be sure to use a WIDE-BAND finger guage when getting your fingers sized! You may want to get a HALF-SIZE LARGER for comfort since the width of our rings make them feel tighter.Ring Sizes Ring WidthSizes 5 to 8.5 6mmSizes 9 to 12.5 8mmSizes 13 to 16 10mm