Synthetic Brushes Set (Green Series)GREEN SERIES Synthetic Brushes Green Stuff World's range of synthetic paintbrushes, GREEN SERIES. Expertly hand crafted and designed to help you paint your armies and figures to an exceptional standard. There are many brush types and sizes and each one has been designed for a different purpose. Synthetic bristles are very similar to natural hair bristles but are more suitable for less experienced painters or for techniques that require a less watered