Simply attach the magnetic button to the edge of the bag with pliers or other items. No needles and threads are required, making it easy for clumsy people. It is difficult to drop your luggage and makes it hard to see inside the bag. Simple design that goes well with various bags. Size: Approx. 0.6 x 1.0 x 1.0 inches (1.75 x 2.6 x 2.5 cm) (1 piece/sticking state) Weight: Approx. 0.3 oz (8 g) Material: Iron, Magnet.