Our flash cards are made of high-quality thick paper, safe for use with various pens, providing a smooth writing experience with no ink bleed-through. The durable material resists tearing and bursting, ensuring long-term use. The cards measure 3 x 5 inches, making them compact and portable. They can easily fit into a pocket or backpack for convenient access and on-the-go note-taking. Includes 9 stainless steel binder rings to keep cards organized, allowing easy attachment and removal. These double-sided lined index cards are ideal for note-taking on both sides, offering an economical and efficient writing solution. The set includes 10 vibrant colors to enhance learning efficiency and aid in color-coding and organization. Ideal for use at home, school, university, or the office, these index cards are perfect for studying, reviewing vocabulary, formulas, and arithmetic, exam preparation, making lists, and general note-taking. You will receive 800 index cards with binder rings, in 8 different colors (100 cards per color), providing ample supply and variety for daily study and work needs. Material: Paper Color: As shown Package Contents: 800 x Index cards 9 x Stainless steel binder rings Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.