Bohin Mechanical Chalk Pencil and Refill 0.9mm - WhiteBOHIN's extra fine mechanical chalk pencil is great for marking on fabric and for use with stencils. The leads provided are white and 0. 9mm in size and they cannot penetrate your fabric. Always try on an extra piece of fabric before applying to your actual project. When using coloured leads, only press slightly when marking. Twist Eraser Long Lasting Environmentally Friendly Great for marking on fabric and with stencils.