Pen Brush Suitable for Watercolour MediumNO LEAK OR SPLASH: The water brushes are made of high quality plastic and nylon material. The water holder has good sealing, water won't leak. The nylon brush tip has good elasticity, not easy to curl or fall off, easy to control, avoiding splashing. EASY TO USE AND CLEAN: Add some water into the pen, squeeze the pen the wet the brush tip, dip in pigment, then you can start to painting, very convenient. After use, just clean it with water, easy to