To produce a stable rotation the platter has a high gravity. Therefor the platter has been made of pure Brass and weighs 16 kg. It is a 1 on 1 copy of the original. As the original platter it has a diameter of 310 mm and is designed to accommodate disks directly. No rubber or other kind of mat is needed. By placing the disk directly the platter and disk merge into a harmonious whole. ( Stiffness is enhanced.)If you want a platter made of Stainless Steel than this can be ordered to.