ESD Brushes are ideal for removing dust, dirt, and left over materials from printed circuit boards (PCB) and other static senstive components. Two sided brush for double the brush life. Brushes minimize static charge generation and remove electrostatic charges to ground when held by grounded personnel. Resistance of conductive fibers: 1 x 103 to 1 x 104 ohms Firm bristles are mainly for electronics, especially circuit boards. Conductive nylon based copper bristles with hog hair and two other natural fibers. Better bristle flexibility and memory retention than pure carbon based bristles for extended brush life. Specifications: Length 4-3/4” (121mm) Brush width 1/8” (3mm) Bristle firmness: Soft Bristle Material: Synthetic Yarn Handle Material: Aluminum