The natural bristles of Reed Haik Brushes are bound and glued into each bamboo reed making it easy to create a custom sized brush - simply break apart between the reeds to make a smaller brush for casting molds or to get into tiny details of texture molds with ease. Use to apply a smooth coating of glass separator or primer on kiln shelves and molds. A must for your coating needs. Natural fiber bristles. Brush flares to 3" to apply shelf wash. to apply shelf wash. 6 reed bresh measures approximately 2".