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Material | ①Carbon steel ball | ②Chrome steel ball | ③Stainless steel ball | ||
Price | ③>②>① | ||||
Hardness | ②>③Series 4>①>③Series 3 | ||||
Highest precision(Grade) | ②=③Series 4>①>③Series 3 | ||||
Rustproof | ③>②>① | ||||










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