Nupla has been an innovator for over 70 years in the development of fiberglass technologies and has earned the reputation as the industry standard for fiberglass striking, cutting, digging, and fire tools. Nupla handles are unaffected by subzero temperatures, do not conduct heat or cold and are impervious to industrial chemicals. Nupla handles are also non-conductive and have a built in dielectric safety feature since Lifetime Nupla glass is one of the finest insulators available. The 12 lb. Extreme Power Sledge features a combination of chemical and mechanical head connection to the solid continuous strand Nuplaglas handle. Nuplaglas is stronger and longer lasting than regular fiberglass handles, added to which the polypropylene jacket provides protection from overstrikes and reduces vibration. With a Guaranteed Lifetime Warranty, This Could Be the Last Sledge Hammer You Ever Have to Buy.