BaseQi NinjaDrive Aluminum 256GB Storage Expansion Card for MacBook Pro Retina 13" (iSDM303MASV - 256GB) 256GB (MLC) Storage expansion card for MacBook Pro Retina 13" Max Read: 99MB/s, Max Write: 90MB/s Use aluminum material and each one is CNC precision machining. Toolless : When you remove without any tools