Chroma Watercolor Brush Markers and Circular Paper Pad Boost your creativity with these easy-to-use, versatile brush markers (XD9152 - sold separately). Just dip in water and start painting. Or add water to your paper first, then start painting. The tips are synthetic bristles for a true watercolor brush feel. Set of 18 colors. Circular pad (XD9162) is 20 sheets of 140 lb. acid-free, 10" diameter paper, bound on all sides to prevent warping.