An alloy (often of lead or tin base) used for bearings WordNet 3.0 & Open English WordNet

The white metals are a series of often decorative bright metal alloys used as a base for plated silverware, ornaments or novelties, as well as any of several lead-based or tin-based alloys used for things like bearings, jewellery, miniature figures, fusible plugs, some medals and metal type. Wikipedia

Any tin- or lead-based alloy. Wiktionary