brush gold series siberian kolinsky brush size 1 green stuff worldGOLD SERIES Siberian Kolinsky Brush Size 1 GSW's range of premium quality Kolinsky brushes, GOLD SERIES. Expertly hand crafted with a high quality wooden handle and brass ferrule, only the best parts of Kolinsky Siberian hair have been used in the making of the Gold Series brushes, producing high end brushes of the highest quality. They stand out from the mid range in their greater paint load capacity, greater autonomy, and masterful fine line