3m Sortable Ruled Index Cards Sort-and-stick cards are ideal for outlining and diagramming, and as study cards. Reinforces reading organization structures using building blocks of letters, words and ideas—learning to read, research papers, speeches. Combines tactile and visual learning; flashcard review, posting hard-to-learn vocabulary, taking important notes from texts. Index Card Type: N/A; Color(s): Apple; Machine Compatibility: N/A; Ruling: N/A.