Standard power drive hammers are engineered to perform better than rubber or plastic face hammers. Using Nupla's patented Smart Hammer technology, the shot-loaded composite interior cavities of these dead blow hammers are fully encased in a tough polymer outer jacket. When the hammer is struck, the free flowing inner shot concentrates striking power and increases driving force creating a dead blow effect. No rebound upon impact transfers full energy of the blow to the object being struck. - Hammer faces are abrasion and impact resistant. They are designed to withstand severe striking applications and are surface protective. Lifetime warranted Nuplaglas handles are constructed with thousands of fiberglass strands and a unique resin to make them super strong, all-weather, chemical and insect-resistant. Ergonomic non-slip grips for slippery conditions.