24 colours of refill are available Extra wide felt tip for best calligraphic effects Fast efficient surface area filler This is for 1 x 50mm marker The 50mm is the widest marker in the acrylic paint range, the massive extra wide tip is great for calligraphic effects on a large scale. Users can apply marks firmly and exactly with even color distribution and great consistency. If you want to fill in large surface area fast then this is the pen for you, replacement tips are also available seperately.