The cards in this 572-card set measure 2 1/2" by 3 1/2". The 1960 Topps set is the first Topps standard size issue to use a horizontally oriented front. World Series cards appeared for the first time (385 to 391), and there is a Rookie Prospect (RP) series (117-148), the most famous of which is Carl Yastrzemski, and a Sport Magazine All-Star Selection (AS) series (553-572). There are 16 manager cards listed alphabetically from 212 through 227. The 1959 Topps All-Rookie team is featured on cards 316-325. This was the first time the Topps All-Rookie team was ever selected and the only time that all of the cards were placed together in a subset. The coaching staff of each team was also afforded their own card in a 16-card subset (455-470). There is no price differential for either color back. The high series (507-572) were printed on a more limited basis than the rest of the set. The team cards have series checklists on the reverse. Cards were issued in one-card penny packs, six-card nickel packs (which came 24 to a box), 10 cent cello packs (which came 36 packs to a box) and 36-card rack packs which cost 29 cents . Three card ad-sheets have been seen. One such sheet features Wayne Terwilliger, Kent Hadley and Faye Throneberry on the front with Gene Woodling and an Ad on the back. Another sheet featured Hank Foiles/Hobie Landrith and Hal Smith on the front. The key Rookie Cards in this set are Jim Kaat, Willie McCovey and Carl Yastrzemski. Recently, a Kent Hadley was discovered with a Kansas City A's logo on the front, while this card was rumoured to exist for years, this is the first known spotting of the card. According the published reports at the time, seven copies of the Hadley card, along with the Gino Cimoli and the Faye Throneberry cards were produced. Each series of this set had different card backs. Cards numbered 1-110 had cream colored white back, cards numbered 111-198 had grey backs, cards numbered 119-286 had cream colored white backs, cards numbered 287-