The 0.8mm point is a ceramic rolling ball that glides smoothly and gives an even laydown of ink without pressure so it does nor damage fine fabrics.  Just a light touch is needed with this easy-flow ink which is pale blue then becomes a deeper colour after a moment on the fabric.
Easily removed with water or use the Sewline Aqua Eraser to remove lines.
Important : Do not iron the marks as they may set.