Members in the "Sphyrna" group measure in size from the Scoophead, which is 100 centimeters (1 meter) long, to the Great hammerhead shark, which is 610 centimeters (6.1 meters) long. The Smalleye Hammerhead Shark weighs around 9 kg, and the Great hammerhead shark weighs about 230 kg. Members of this group are usually light grey or brownish grey in colour with a tint of green, and have a white belly.