My daughter asked me for these for study purposes. This set by Koogel contains 300 notecards in six colors: blue, purple, pink, yellow, green, and red. Notecards are 3x5". My daughter loves how thick and durable they are, the rounded edges her favorite feature!) And how they are pre-punched with ring to hold cards in place. She enjoys mixing and matching colors to have some fun and the rings are easy to open and allow for this. Very pleased with this purchased and would buy again and again! 5 stars!