Why Brass Cylinder?! Because Brass is good when it comes to bearings, Valves and whatever goes under high pressure. It is so durable under pressure. Also, Brass is stiffer than Aluminum. Metals such as brass are often chosen for bearings, bushings, and other sliding applications because of their resistance to galling. Maybe Aluminum is good to make Grinder but not for Tincture press. This Press is designed by Engineers to handle very high pressure . Dowels distribute even pressure. You must try it to see the difference. Manufactured by TitanOwl. Note: This tincture press cannot make tablet or pills.