Novak Solder - Silver 6g Lead Free This is Novaks Lead-Free Silver Rosin-Core Solder. It contains 6 grams of solder, which is approximately 4 feet (1.2 meters), and is the same solder that Novak uses. It is environmentally-friendly and specially formulated for hand soldering. It contains 3% silver for high-conductivity, low-resistance and for strong solder joints at a relatively low melting point. Meets RoHS compliance standards.