This bundle features six of GRAV’s most popular bong bowls. Each of these borosilicate glass bong bowls is made for a 14mm downstem. Multiple bong bowls keep you smoking even when a bowl is broken, lost, or dirty. The Caldera glass bowl is an upgrade for any bong if you want longer sessions and bigger hits. In addition, the Caldera bowl is ideal for group smoke sessions. The Basin bowl is a stylized and easy-to-load bowl good for shorter two-person sessions. The Octobowl’s glass screen is designed to catch ash and tar and hold plant matter in place, and an arm on the side of the bowl allows for safe handling. In addition, the Octobowl's substantial capacity is designed for use with larger water pipes and upright bubblers. The Helix bowl is ideal for one-hit bong rips. The side handles make it easy to pull. The cup bowl's limited capacity is designed for smaller water pipes and Helix™ pipes. The standard funnel bowl's substantial capacity is designed for use with larger water pipes and upright bubblers.