Bohin Ceramic Mechanical Pencils are my "go to" marking instrument. I can see the extra thin, consistent line on any fabric (five colors to pick from). The line stays in long enough for me to use it (quilting, applique). And I can get every bit of the marks OUT when I'm done. 90% comes out after I sew through it, the rest with a gentle wash. (The marks can also be erased, but then you have to deal with the eraser droppings; I'd rather wash.)
Your Bohin refill has 6 leads in each container. Each refill will come with a free BIC mechanical pencil, the barrel of which will match the refill color (except for white and gray --- you'll get orange and blue, respectively). Price is for ONE refill. Please purchase by color refill below.