Knock Knock Personal Library Kit Refill (Pack of 2) Go to amazon.com Related posts Top 8 recommendation library kit FeatureSet of 2 - Refill KitsThe perfect gift for the generous reader!30 Self-Adhesive Pockets30 Insert CardsEach Card Measures: 4.75 x 2.5 inches DescriptionPersonal Library Kit Refill includes 15 self-adhesive pockets and checkout cards. Combine with Knock Knock's Personal Library Kit.