This 36-card set, which measures the standard size, was issued by Impel for the second consecutive year. Collectors Marketing Corp., the 1990 Collect-a-Book producer, was a division within the Impel Corporation. This 1991 set was issued under Impel's Line Drive brand. Each book consists of eight pages and fits into a standard size plastic sheet. The set features 27 active stars and nine famous retired stars. An action shot of the player is pictured on the first two pages. The next four pages has textual information broken down into biographical information& two pages of more detailed personal information and a page of statistics. The inside back cover has a quote from the player pictured while the back cover has an attractive drawing of the player. Unlike the 1990 issue, the Collect-A-Books were issued in random packs.