This is a new 18K Gold Royal Yellow Solder. Great for general repair & sizing of rings. Hoover & Strong plumb gold solders comply with the Gold and Silver Stamping Act Amendments. Hoover & Strong Repair Solders are lower karat and easy flowing, because these karats are lower karat they may not color match karat gold as well as plumb solders. Metal - 18K Gold Solder Type - Plumb Gold Solder Recommended Use - Sizing/fabrication Melting Point - 1430 Flow Point - 1535 Approximate Weight - 1.5 grams