Top-Ranked Fine-Grained Categories of beryllium_copper: =>see poetic categories

• soft:material,
• metallic:material,
• common:metal,
• exotic:material,
• solid:material,
• exotic:metal,
• springy:metal,
• elastic:metal,
• springy:material,
• flexible:metal,
• tough:material,
• base:material,
• conductive:material,
• resilient:material,
• expensive:material,
• metal:material,
• red:metal,
• layer:material,
• resilient:metal,
• conductive:metal,
• specialized:material,
• nonmagnetic:material,
• springlike:material,
• soft:conductor,
• flexible:material,
• optical:fiber,
• elastic:material,