These Japanese made waterproof markers give you an effective and inexpensive way to advertise sales, welcome customers, or extend seasonal greetings. Use these markers on windows, glass cases, or black or yellow Re-Markerable reader or menu boards and sign cards. Re-Markerable markers do not wash off with water. Use glass cleaner and a soft cloth or paper towels to remove. Choose from 2 sizes of Zig Posterman window markers - 1/4" nib. and 3/4" nib.