MacBook Pro (13-inch, 2017, Four Thunderbolt 3 ports) - Technical Specifications
SSD In Late 2016 'Entry-Level' MacBook Pro Removable
15-Inch MacBook Pro With Touch Bar Has Non-Removable SSD - MacRumors
Amazon.com: INDMEM NVMe PCle SSD 512GB 3D TLC Flash Hard Drive with Tools for Upgrade 2016 2017 13" MacBook PRO A1708(EMC 2978/3164 Non-Touch Bar Models(Late 2016-Mid 2017 Year) : Electronics
New 15-inch MacBook Pro appears to offer fastest SSD performance on the market - 9to5Mac
TKD 2TB SSD Hard Drive Replacement for MacBook Air / Pro 11" 13" 15" A1502 A1398 A1465 A1466 (Late 2013, 2014, 2015, 2016, 2017) / Mac Pro A1481 / Mojave / 5YR Warranty - Newegg.com
Amazon.com: INDMEM NVMe PCIe SSD 256GB 3D TLC NAND Flash Hard Drive Replacement for Mid 2013-2017 MacBook Air, Late 2013 - Mid 2015 MacBook Pro Retina, Late 2013-2017 iMac, 2013 Mac Pro, 2014 Mac Mini : Electronics