Fantastic compound prevents heat transfer so effectively you can heat one end of a steel bar red hot - while holding the other end in your bare hand! Absorbs heat that would cause adjacent parts damage during welding, brazing, heat-treating and soldering. One of the greatest chemical developments ever for the gunsmith. For welding bolt knobs, shortening actions, installing ramps and sights, plus all milling and grinding operations where it protects expensive, hard-to-replace drill bits and cutters, as well as the gun. Odorless, non-toxic, no fumes, won't harm skin, won't stain surfaces applied to, won't melt or run, and cleans up easily with water. Mfg: Brownells SPECS: 1 lb. (453.6g) net weight.