A time proven technique for effective soldering and minimal heat dissipation thus concentrating the heat in the work area resulting in less time and energy during soldering. Under flame, the charcoal glows and reflects heat back in to work, making the flame more efficient. Select, close-grained knot-free wood is chemically prepared with a special process for soldering. The most traditional block for soldering favored because of its natural softness enabling you to push items, pins or binding wire into the surface. You can also scoop out sections of the charcoal to use the block as a crucible for melting material in. Measures: 4-3/4" L x 3"W x 1-1/2"H (120mm x 75mm x 40mm) Weight: 4 Oz.