This ad features a cone shaped glass slide head piece bowl for your bong, water pipe that is over-all about 3" long and has a 14mm joint size with a grip feature. The actual bowl part of the slide is a deep cone shape and 3/4" in diameter at the top surface and about 1" depth.
This item is a hand made glass art item (vs. exact machine made duplicate) and as such will vary in exact size, color and features (but will always fit a 14mm joint). The last slide shows the color variation you can expect, and the piece you receive will be similar to one of those shown.
Good quality glass construction and good looking. A great gift for yourself or your friends.