The required materials and tools:
1. Yarn, I used:
- Gazzal Baby Bamboo (50% acrylic/50% bamboo, 50g (1,76oz)/115m (125yd)) blue (95201), red (95204), white (95227) and beige (95230) colors

1. 2.5 mm crochet hook
2. Scissors
3. Tapestry needle

Abbreviations (US):
Ch - chain
Sc – single crochet

The finished coaster using the materials stated in this pattern is ~3.5 inches / 9 cm in height and ~3.5 inches / 9 cm in width.