Eco-Kids' cruelty-free nylon filament paint brush assortment includes large and small flat, angled and round brushes. Durable and flexible, they are best used for water-based paints like tempera, acrylic and watercolor. Easy to clean up with mild soap and cold water, then re-shape the filament and dry the brush completely before storing. The “Plastic” bag the paint brush set comes in is made from polylactic acid (PLA) obtained from plants and is completely home compostable. Ages 3 and up.