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The 895, 795, 775, black 550, and blue 550 are equipped with ball bearings and built-in cooling fans, which automatically reduce heat, ensure service life, and ensure longevity. (The strong magnetic 550, 540, 390 motors are of copper sleeve structure, without fans or ball bearings).
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.