Charcoal Soldering Block This is the worlds best Charcoal Soldering Block, made of hardwood with great life and durability. This is not a soft charcoal so it will last three to five times as long as other charcoal blocks. It also has better heat retention, making soldering faster and easier. Works great on Gold, Silver and even Platinum. Size: 5-1/2 x 2-3/4 x 1-1/4