Sterling Silver. The petite blades measures 1/4" (10mm) long and 4mm wide.  The dangle itself is about 1 1/4" long plus the French wire, overall the earring is about 1 1/2" long or about 38mm long. The rowing blade shown in the photo is a hatchet blade, and the tulip is the symmetrical 'classic' shaped blade that is most commonly recognized by non rowers as the rowing oar.

Available with French wire (as pictured) or lever backs. FYI- lever backs are a dangle wire with a spring-loaded 'arm' that allows the wearer to close the wires.