| RWMA Class | Description and Primary Uses |
| 2 | RMWA Class 2 material is a highly conductive and high strength alloy recommended for structural, current carrying secondary components and electrode holders. This is a heat treatable alloy used in the fully heat treated condition. |
| 3 | RMWA Class 3 material is a high strength copper alloy with moderate conductivity recommended for structural secondary components and electrode holders subjected to high forces. This is a heat treatable alloy used in the fully heat treated condition. |