Designed with summer campers and college students in mind, the Rub A Dub Laundry Marking Pen is the easy way to add identification to your clothing, sheets, towels, etc. It works best on white or light colored fabrics and synthetics. Perfect for clothing, camping gear, etc. Won't launder out, even after repeated washings. Add ID information to clothes, linens, camping gear. Great for summer campers and college students. Works best on white or light colored fabrics. Won't launder out, even after repeated washes. 1.0mm point.