White Rhino 19/14 Glass Downstem Display 49ct GLASS ON GLASS DOWNSTEMS. White Rhino glass on glass downstems are 19/14mm and come in a variety of sizes: 3.0" / 3.5" / 4.0" / 4.5" / 5.0" / 5.5" / 6.0". Sold as a 49 piece display, there are 7 of each size included.