Glass-on-glass funnel bowl with a 14mm male joint, which fits at 14mm female joint. Typically 18mm to 14mmm down-stems, the standard downstem size on a for a bong. The bowls comes with a glass handle, which can vary between a rod or a flat disc handle. The funnel shapes hold a good amount of dry herbs and the hole in the bowl is measured to be the right size.
This is your go-to standard borosilicate glass-on-glass bowl. Available in 14mm or 18mm.