Made of oxidized sterling silver plated brass.
You may adjust it by squeezing the gap closer, or widening it about 0.5mm, it is less than 1/32 inch. That is enough to change the size.
This item is available on pre-order. Which means it’s not in stock and shipping time is 10-15 business days since your payment been completed.
If you have questions or you would like to make custom changes – contact me before placing an order.