... materials such as aluminium, stainless steel, brass, bronze, copper, lead, and even tungsten in weighting, balancing (for example, modifying ... and are banned (such as lead) or when secondary operations costs (such as machining, finishing, or coating) are a factor. Engineered ... grain balsa wood, bonded to surface skins of light alloy or GRP. These generate low-weight, high rigidity materials.Properties ...