The ring is made from black niobium (a hypoallergenic material that stays black really well) and the lock is handcasted in recycled sterling silver. After I get it back from my caster, I give it a rough finnish, oxidize it and put it in my tumbler togive it it's unique finnish.
I make this ring with 1mm (18g), 1.2mm (16g) or 1.6mm (14g) in black niobium wire in three different sizes: small, medium and large. The small one measures approx . 9,5mm inner diameter , the medium one approx. 11,5mm inner diameter and the large one approx. 14,5mm inner diameter.
The last picture shows all the ring sizes but in a different model.