Double Matrix showerhead and is about 5mm glass thickness. Splash guard design. Shower head design. Joint size of 19mm comes with a 19MM Down stem with 14MM male glass bowl for dry Herb. The shower head perc is what makes this water pipe really unique. It has about 32 diffuser slots in the showerhead perc area. The tiny slots in the disc forces the smoke to be diffused. Diffused smoke means nice and cooled off smoke for a smooth hit. This pipe also features a splash guard to prevent water from splashing on you whilst smoking. Enjoy this new smoking technology with old fashion Herbs.