This Finetec Artist Watercolor refill is made with mica, a natural mineral that shimmers and shines. Ideal for adding special effects and highlights to watercolor paintings, and also for calligraphy. Blend Mica Watercolors to create unique shades. Colors adhere to all absorbent surfaces, including paper, wood, and gypsum. The Arabic Gold refill pan measures approximately 1-1/16 inch in diameter and can be used as an individual pan or as a replacement.