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Watercolour brushes have soft bristles that can be easily moved around the page. They are also designed to hold plenty of water so they don't dry out midway through a stroke. Trying to use oil and acrylic brushes to paint with watercolour will not give you good results.
This set of watercolor brushes are made from high quality nylon hair bristles, wooden handle on black nickle aluminium and comes in a set of 5 brushes each. You can have a choice of flat, rounded, filbert or oblique styles.