Kogin is a type of embroidery that resembles Norwegian smøyg (pulled thread work) or counted stitch. Geometric patterns are created by covering areas of fabric with horizontal stitches, counting your way between loosely woven fabric and building up the pattern row by row.
Learn more about the technique here.
These kits contain a needle, thread, fabric, and instructions (illustrated diagram with Japanese text - see the link above for general guidance) for 2 coasters, or other projects should you have ideas for something else.
Finished product measures approximately 9.5 x 9.5 cm