Swiffer Dusters TRAP + LOCK dust and common inanimate allergens from cat and dog dander and dust mite matter. Made with specially coated fibers that grab onto dust and don't let go. They are uniquely designed to Trap + Lock dust from even the tight spaces in your home or office. Bristle Material: Dust Lock Fiber; Bristle Length: 6"; Bristle Depth: 2"; Bristle Color: Light Blue.