The product is a 1 pound bag of Borax Flux by the brand JTS. This white granular material is suitable for casting and melting gold and silver, acting as a crucible glaze for jewelry making. Made in the United States, this product comes with a California Prop 65 Warning due to its potential to cause cancer and reproductive harm. It is a valuable tool for jewelry enthusiasts looking to melt and cast their own pieces with precision and effectiveness.