The Wonder ring is open ended and slightly adjustable even though it comes in different sizes. I guess because it's a lot of solid sterling silver 925 and hence the adjustability won't be too generous. The surface is polished with spotty texture. A first glance reminds you of the Wonder Woman wrist cuffs :-)

Shape: Chunk of a solid band
Size: a wrap of 20mm width of band with 20mm top to bottom width down to 15mm to both edges
Type: Solid
Surface of the ring: Silver 925 polished 
Inside of the ring: Silver 925 polished 
Weight: 7.5 g