mop brush

a large, roughly textured paintbrush used for applying thick paint in an impasto style

A mop brush is a large, paintbrush with rough, stiff bristles designed for applying thick layers of paint. Its broad and textured bristles make it ideal for creating bold, textured strokes and adding a lot of texture to the surface of the canvas. The mop brush is often used in oil and acrylic painting to achieve a strong, textured effect, allowing artists to build up layers of paint and create expressive, three-dimensional artwork.