Thanks for your question. The Mace is the symbol of the authority of the House of Representatives and the Speaker. It is 132cm long, weighs 7.8kg and is made of gilded silver (silver covered with gold).
In medieval England, the royal Serjeants-at-Arms carried a mace stamped with the Royal Arms. This was a weapon used to assert the authority of the monarch. By 1415, the House of Commons in the British Parliament had appointed its own Serjeant-at-Arms to serve the members of the House. The tradition of the Mace in the House of Representatives is taken from this practice in the House of Commons.
Find out more about the Mace with this fact sheet.