Reddit mentions of 1 X Chinese Calligraphy Black Ink (yi de ge mo Zhi) 100G

/u/albatrossd covered most of it, but I just wanted to add a few things from personal experience.

When grinding the ink, be patient. Don't use too much water or it will be unusable. Start with a few drops and move the stick of ink in circular motion. To be honest, I recomment buying bottled ink for chinese/japanese calligraphy, you can probably find some on amazon. Like this one. After you finish with a session, the ink will dry out, but the next time you use it, you can add a few drops of water and just grind it out again. That way you save a lot of ink compared to cleaning it every time.

For the first time you're using the brush, leave it in a cup of room temperature water for a few hours to a day. That will soften it up and allow you to actually write with it. The top one with yellow coloured tip is probably weasel hair and the bottom one is probably sheep. The sheep hair brush will be softer and easier to use imo so i'd start with that one.

Oh and you also need paper, i think this would work pretty well. And although not necessary, a mat like this can prevent ink from seeping onto your table.

I love chinese calligraphy, it's a great way to relax and meditate and takes your mind off everything else.