★ material: 316 titanium / Obsidian / purple sand

★ size: width 0.8CM

There are 7 yards， 8 yards， 9 yards， 10 yards

Boys generally take 8 yards

7 yards， the inner diameter of about 1.75CM， length 5.45CM

8 yards， the inner diameter of about 1.85CM， length 5.7CM

9 yards， the inner diameter of about 1.9CM， length 5.95CM

10 yards， the inner diameter of about 2CM， length 6.2CM

The titanium， the kind of texture is very good， with the two stones， purplesand material is very good-looking， like the stars in the sky

There are also other cheap edition， but the quality is not good