Two times the showerheads means two times the smoothness! Watch the smoke transfer through the heavy duty double chambers. Beautiful matching black bowl, lip, base and showerhead make this a premium label item from Macro. Made of high quality borosilicate glass. About 5mm thickness. Ice Catcher. Thick lip for comfort. Joint size is 14mm. Diameter of base is about 4.5 inches. The domed perc doubles as a splash guard and smoothens the smoke.