2.7 kg, 3.6 kg, 4.5 kg and 5.4 kg
Common Characteristics
With special heat treated head with a hard core and a soft striking face to avoid fractures or chipping
Unbreakable rubber handle reinforced with a high carbon steel spring rod
Hard core safeguards head to the handle
ANSI/HTI B173-1991, ASTM A576 (head), ASTM A421 (handle)
Convex (domed) striking face