You get an 6 of these great fat rondelle beads (~0.65mm hole) in the color you select from the pull down menu. A reminder that monitors will display colors a bit differently so if you are looking for an exact shade, please send a message. This picture is enlarged to show detail.
Cultured sea (some call beach glass) has been physically & chemically weathered which produces natural frosted glass giving these the same effect as pieces of sea glass you find along the ocean shores - but you get a bigger color range with the cultured sea glass.
There are plenty of free online measurement converters.