71 x 56 x 6/9 mm (6 mm tall at the outer edge, 9 mm tall on the inside, at the peak of the bevel). Installed correctly, with the cone sloped side facing down, the beveled edge of the cone shape adds an additional surface for your portafilter basket to seal against. The little Simonelli symbol goes "up" in to the group slot.
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.