2015 MacBook Pro 13 inch refresh guide (Thermal paste, SSD, Software, Undervolting) : r/mac
512GB SSUBX SSD Apple MacBook Pro Retina 13" A1502 Early 2015, 15 A1398 Mid 2015 | eBay
MacBook Pro 13-inch with Retina display (early 2015) review | TechRadar
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Refurbished 13" Apple MacBook Air "Core i5" 1.6GHZ 4GB Ram 128GB SSD