Precision

Balls made from metals without iron content.

Precision steel balls, usually chrome steel (e.g., AISI 52100).

Spherical balls made from soda-lime or borosilicate glass.

Balls made from iron-based alloys, typically carbon steel or alloy steel.

Balls made from advanced ceramics such as alumina (Al₂O₃), zirconia (ZrO₂), or silicon nitride (Si₃N₄).