Oxidized fold formed Copper cuff

Use a tape measure or a string with a ruler. Measure below the wrist bone and hold the tape or string so it is comfortably snug, neither tight nor loose. Select Size to Fit and enter the measurement where requested.

Fold forming is heating and folding the metal, then hammering the fold tight. When opened it leaves a hard, raised line that strengthens the metal like a girder, is a decorative feature, or both.

As long as the sealant coat is intact this bracelet will not tarnish or change color, so clean it with ordinary soap and water if needed.  Do not use ultrasound or copper or brass polishes.  They can damage and dull the sealant. Avoid contact with solvents like nail polish, nail polish remover and petroleum products.

Your bracelet is wrist shaped--a flattened oval.  If you want to adjust the fit do it slowly and gently, with both hands wrapped around the bracelet to support it from all sides.  Shape it a little at a time instead of in one big push that might crease it.