Lab series stones are made of pure aluminum oxide and are free from carbon contaminants. Use the White Lab Series Stones for finishing noble and predominantly base ceramic metals, Pink Lab Series are for high noble ceramic metals and Coral Lab Series are for chrome-cobalt and nickel alloys. - Aluminum oxide grit free from carbon contaminants - Use lab series white for finishing semi-precious & non-precious alloys. - Use lab series pink for precious alloys - Use lab series coral for chrome-cobalt & nickel-chrome alloys.
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