15oz Nail Hammer ‘Ultra’ series with a Nylon Vinyl Shock Reduction Grip® are engineered lighter and stronger. The sleek new profile make them lighter and areodynamic. Estwing hammers are forged in one piece out of fine tool steel for long life and dependability. No welds. No joints that can fail. Plus, these hammers feature Estwing’s world famous and patented Shock Reduction Grip. The most durable and reliable grip put on any striking tool.