Colored glass downstem replacement for your water pipe. Or to jazz it up. 

These are approximately 18mm tapered diameter joint with a 14mm hole for your slide bowl of choice.

The measurements are done from the bottom of the downstem to the bottom of the joint. The joint section adds about an extra inch.

So the 2.5" downstem is 3.5" overall.

These measurements are an average and will vary slightly from downstem to downstem.