These brushes are made of PBT (polybutylene terephthalate), a chemical fiber ideal for brushes. The tips are consistent, strong, and sturdy, providing excellent drawing performance. This set includes two small and two medium round brushes for easily drawing curves, and one large brush for painting large surfaces and corners. This combination expands your drawing capabilities. Paint Brushes Round No.0: H18.5cm, No.10: H20.5cm, No.12: 20cm Blue