The ring is open in the back and fits all.nThe top of the ring is 21mm dimeter (0.82 inch)nMade of Brass and plated silvern1000K' ways features a selection of high quality Jewelry and offers great value in affordable price. This product is made with top quality materials. The Ring is made for man and woman. The ring is all one-piece mold of brass, easy to clean, easy to shape. The ring fits up to 10.5 size and can go as low size as you like (4.5 is possible) by cramping it to your size (see picture). Shaping: can open 5-6mm more (0.25inch approximately) or as small as you wish by one side on top of the other on the back (it's comfortable and easy to do). When the open sides of the ring are touching, it is size 7.5 Jewelry type: fashion, symbolism Jewelry finish: plated Stone: no stone Clasp: open back Color: Silver Ring style: signet ring, seal Metal: brass