2.5" 525GB SSD Solid State Drive. Genuine Crucial SSD, used tested and working. with Mac OS High Sierra pre-installed. This is a used item so it may be dirty / very dirty / faded / yellow'ish / scratched / liquid marked / rusty and or have stickers / tape marks so it will not be in its original condition, if it's a multiple the one photographed may not be the one you receive.
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