The base set consists of 200-cards on a mirror-like sheen, reminiscent of Refractors. Veteran cards have gold highlights while rookies and prospects have blue highlights. There are three subsets: Best Performers (86-100), Prospects (101-150), and Rookies (151-200). Rookies are serially numbered to 2,999 on the card back and are randomly inserted on the average of 1:7 packs. - 2007 Standard Catalog of Baseball Cards, 16th Edition.