The fingered tree perc that is in the middle of the water pipe bubbler has several arms or finger percolators. Each finger contains tiny slots. The fingers forces the smoke to go through a long path making it very smooth. This high quality, heavy duty water pipe is made of borosilicate glass and has a sick blue head and a matching dry herb bowl. Blue dry herb bowl included, 4" base diameter, 1.5" diameter water chamber. Water pipe 19 mm female joint comes with 19 mm male blue dry herb bowl.