Solder materials are synthesized from tin, lead and a variety of chemical activators. They produce toxic components when soldered. This filter sponge is effective in preventing the absorption of toxic flux and lead smoke. Honeycomb activated carbon air filter. With good adsorption performance, it can be used for air purification. Size: 130 x 130 x 10 mm; Quantity: 5 pcs, Weight: 0.1212542441 Pounds, Manufacturer: Plentoy