This pattern is crocheted in individual rounds. You can use any yarn and color that you like. Use suggested size hook for the chosen yarn. I used Yarn and Colors Must have on hook 3,5 mm. My coasters measure 10 cm. I used 5 colors but only 2 colors is possible too. You need to change color every other round.
With the yardage mentioned you should be able to make 6 coasters, the holder and the lid. I used mainly scraps of yarn.

Find the tutorial for a coaster in this video. https://youtu.be/zYGdcgGBdjk