Channel Marker Buoys are approximately 19" - 21" tall (from base to top of glass) this variation in height is is because the Frensel Glass Globes we obtain are purchased "Vintage" (antiques) Globes. The globes were manufactured by several different companies in the past, but though they are similar, they are not always identical. If a pair (red & Green) of Buoy Markers are ordered together, we do our best to match them as close as possible.