S = 9-Piece Set M = 12-Piece Set L = 20-Piece Set. Product Structure: Each set includes a specific number of magnetic bookmarks and corresponding backing cards. Crafted from white cardstock and flexible magnetic sheets, the folded thickness of each bookmark is 1.66 mm. The backing cards feature specially designed die-cut slots for securely holding the bookmarks. Printed with inspiring and humorous slogans, the items are adorned with illustrations depicting Black women engrossed in reading. Versatile Application: Ideal for use in both school and home reading environments, these bookmarks securely clip onto the inner pages of various types of books. They make perfect gifts for a wide range of occasions, including Christmas, Reading Festivals, birthday celebrations, and more. Strong Magnetic Grip: Featuring powerful magnetic attraction, the bookmarks hold firmly in place and resist slipping off. Weight: 0.24 lbs.