You can get a description from the US First website.
http://www.usfirst.org/roboticsprogr...ocumentlibrary
Click on the link for the 2011-2012 Resource Kit Components.
Also, if your are ordering for an FTC team, use this link to get your discount..
http://parts.ftcrobots.com/Default.aspx?bhcp=1
The cost of the kit is the same, but you recieve more parts (including 2 motors with hubs, mounts and wires, and a logitech controller).