Brass tubes yog hollow cylindrical pieces ua los ntawm tooj dag, ib tug alloy ntawm tooj liab thiab zinc.Cov raj no tau siv dav hauv ntau qhov kev lag luam vim lawv lub zog, kav ntev, thiab corrosion kuj.Tau ntau xyoo, tooj dag raj tau dhau los ua ib qho tseem ceeb hauv cov manu ...
Nyeem ntxiv