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. Metals such as brass are often chosen for bearings, bushings, and other sliding applications because of their resistance to galling. Also, Brass is stiffer than Aluminum. Maybe Aluminum is good to make Grinder but not for Pollen press. This Pollen Press is designed by Engineers to handle very high pressure and can press the herb and shape it as a small round solid disc in size of 3/4". It has two Dowels to distribute even pressure. You must try it to see the difference. Manufactured by TitanOwl
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