[robocat]

Likely to be either billets or sheet ingots.

Billets: https://www.google.co.nz/search?q=%22aluminium+billets%22&tb... An example of dimensions: “Most of the produced billets by the South Aluminum Industries Complex are produced in the form of cylinders with a diameter of 280 (11 inches) and a length of 7,500 mm” and some details of their manufacturing process here: https://en.salcocompany.com/aluminum-billet/ Billets of various diameters are used in aluminium extrusion machines: https://www.aec.org/page/aluminum-extrusion-process-basics

Ingots are rolled to produce sheet, which I think is the majority usage by weight of Al: https://www.metalex.co.uk/expert-aluminium-plate-suppliers-e... “The rolling process kicks off with massive, pre-heated metal sheet ingots weighing as much as 20 tons. The ingots tend to be around six feet wide, twenty feet long and over two feet thick.”