From the Rico website: 

This year's Ricorumi Advent calendar will make the pre-Christmas period a creative highlight. The 24 doors of the high-quality Ricorumi Advent calendar contain both yarn and accessories that are needed to create a great Christmas project. With the materials and detailed step-by-step instructions, a crocheted surprise that can be individually designed can be created over the Advent period.

- Ricorumi Advent calendar with 24 small boxes 
- for crocheting a Christmas surprise
- including crochet hook