This is a set of 2 rubber grommets: 1 Hose Grommet and 1 Bowl Grommet.
The first one seals the connection between the hose and the hookah hose adapter and the second grommet seals the connection between the hookah's bowl and the stem.
These 2 grommets provide an air tight seal for your hookah hose and bowl.
Please note that the size, diameter and the color of the grommets may vary. These grommets will fit most hookah hoses and bowls.