Sashiko thread is made of cotton, is relatively thick and matte. Unlike embroidery floss, it is spun in such a way that the threads cannot be separated; it is used as is.
This thread is thinner than the most traditional sashiko thread, and is therefore better suited for thinner materials. Sashiko is often done on denim, linen, hemp, and so on. With a thinner thread, you can more easily sew on lighter and thinner materials, or even on thick ones, for a thinner line and a different effect.
The thread is from Olympus Japan, a company that is over 100 years old! They have a lot of experience, in other words :)
Sashiko thread is a little more "fluffy" than embroidery floss, and adheres nicely to the fabric you are sewing into, blending in over time as an integrated part of the material.
Instructions for sashiko will appear on this website eventually, but it will take some time. Many have wanted sashiko equipment for a long time, so I choose to sell before I can help with instructions in Norwegian for those who want it.
Search for sashiko on YouTube and you will find a lot of good help! There are also dedicated sashiko groups on Facebook, for example, and several handicraft associations offer sashiko courses, so check a handicraft association near you if you are interested! The book Mending Matters also covers some sewing inspired by Japanese handicraft techniques.
You can find needles and thimbles for sashiko here :)