This is the World Cup (WC) version, which means it has a full carbon crown and tapered steerer. It is dual air, which means it has a positive and negative air chamber. It also has adjustable rebound.
The Specialized Brain keeps the forked locked out until you hit a bump, at which point an inertial valve opens and the suspension becomes active. The Brain Fade adjustment lets you choose between softer and firmer Brain settings. Travel is 100mm, and the dropouts are standard quick release.
The steer tube is approximately 168mm from the crown race to the top of the tube. This fork came off a medium Epic, with room for the stem and about 15mm worth of spacers. Let me know if you have any questions.
I'm happy to provide the paperwork (and receipt) from the 150 hour service! The item "RockShox SID World Cup 29 Fork with Specialized Brain 100mm Tapered Standard QR" is in sale since Monday, November 27, 2017. This item is in the category "Sporting Goods\Cycling\Bicycle Components & Parts\Forks". The seller is "kpdue" and is located in Coraopolis, Pennsylvania. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, South Korea, Indonesia, Taiwan, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Russian federation, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Croatia, Malaysia.