From the Manufacturer
There's never been a hammer like the Vaughan Steel Eagle! Forged entirely of high quality, high carbon steel, it has all the toughness and durability you expect in a solid steel hammer. Yet there's none of he irritating hand sting that can make a day's work so tiring. The secret is Shock-Blok, a shock absorbing insert of hickory and specially-formulated rubber. Most of the shock of hammer blows is absorbed by the Shock-Blok plug, the rest by the unique, air cushion grip.