Staedtler Mars 551 Comfort Masterbow Compass

The Masterbow features two hinged legs for accurate and convenient setting. The precision-set center wheel and gunmetal spring prevent flex-back for precise setting of both small and large radii. With a nickel-plated matte finish, it resists tarnishing and finger stains. It renders a maximum circle of 10-1/4", weighs only 2-1/2 oz. and comes in a protective plastic pouch with a box for lead or spare parts.