The 1823-25F from Techspray is a 25ft long No-Clean blue #4 desoldering braid. Desoldering braid is a pre-fluxed copper braid that is used to remove solder which allows components to be replaced and excess solder to be removed. No­Clean desoldering braid (wick) does not leave behind ionic flux residues that can collect and form branches called "dendrites". Other fluxes, if not cleaned properly, can cause dendrites that grow over time and eventually cause short circuits between traces or leads. Latent failures lead to costly returns and lower the quality perception of your products. Available in anti-static spool to prevent static build-up from damaging sensitive components. Meets or exceeds MIL-F-14256, NASA NHB 5300, 4 (34-1), NASA NPC 200-4, NASA SP5002, 1821:HP 8690-0588, 1823: HP 8690-0577, IPC Standard-J-STD-004.