Chem-Wik 10-5L Desoldering Braid
This is the desoldering braid we have used in our shop for years: Chem-Wik #4. The braid itself is oxygen-free copper, impregnated with rosin. This works significantly better than non-rosin braid, in our experience; the rosin content makes solder flow quickly, which helps prevent heat damage to components.
The width of the braid is 0.1 inches (2.54mm). The length of the braid in this spool is 5' (~1.5m).