The pendants and earrings are handcrafted of sterling silver or sterling silver and bronze, depending on the style. The bronze provides the strength the piece needs in order to hold its shape after numerous and continuous marble changes. When a marble is removed, the sides are pinched gently to renew the tension in the mechanism. When a new marble is pushed in, it is held firmly in place.
The Mod Rings also use a modified Pinch Mechanism, although the Mod design has a very positive tension aspect so it rarely needs pinching.