da Vinci Travel Series 1573 CosmoTop Spin Watercolor Brush, Round Synthetic with Protective Case Handle, 8 Portable, travel version of the da vinci cosmotop spin series 5580 round 5 diameter cosmotop spin holds more water than any other synthetic Outer casing protects brush from being damaged, fits in all portable watercolor sets Available from sizes 1 to 12 Certified green manufacturing at the da vinci factory in Germany