Solid ring with a polished surface. It looks like the ring is flowing into its shape, getting thicker and thinner all around. On the second picture on the left you can also see the smaller version SILVER FLOW RING NO2, which is a great match. Made in Hamburg.
Material recycled 925 Sterling silver
Measurements The ring has a round profile. The widest part at the top is about 7mm, the narrowest part at the bottom is about 2.5mm.