Montana ACRYLIC marker - Shock Blue Light - 15 MM - Lightfast - **** (Higher) - Opaque - Perfect tool for all marking jobs, big or small. Great for decorative uses such as poster design, sign boards and display making, the 15mm fibre tip also offers many possibilities for the creative and artistic use. Ideal for calligraphic lettering and filling in larger surface areas, the fibre tip is smooth in application and even in colour distribution.