This kit has everything you need to get started with sashiko and boro mending. It contains 6 sashiko designs printed on denim blue cotton, each 6"x8", ready to stitch with the included sashiko needles, leather sashiko thimble, and 100 meter skein of sashiko thread. The kit also includes 1/4 meter (10"x43") wagara cotton fabric.
Stitch the sashiko designs, then use them and the wagara fabric to patch clothing, or make a bag or other project.
There is not a lot of instruction so if you are not confident here are a few blogs which may help: