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 Call for availability and polishing prices. Brass is provided unpolished. Muntz metal is available on special request. Please note we do not recommend bright polishing the aluminum balls due to the porosity of the material.Note: Hollow balls have a drilled alignment hole. 1-1/2" to 6" diameter have a 3/16" hole while 8" to 12" diameter have a 5/16" hole |