synthetic bristle is made from Polyethylene terephthalate(PET) and Polybutylene terephthalate(pbt).

When it comes to brushes, why use synthetic bristle for brushes? 

Below is the advantage for synthetic bristle:

• Synthetic bristle is vegan and cruetly free for animal. 
• Most synthetic filament can be used for oil-based and water-based paints
• More cost-effective than natural bristle.