4 Black hijab pins. The Black hijab pins with oval opening are made of strong acrylic with an easy to open and close but secure metal safety pin. The pins do not snag clothing like regular safety pins because the metal loop is covered by acrylic. Perfect for shawls, scarves or any piece of clothing. Pins are approximately 1.5" (4 cm) long x .625" (1.5 cm) wide.