MG Chemicals Desoldering Braid #4 Fine Braid Super Wick with RMA Flux, 100' Length x 0.1" Width, Blue Oxide-free clean copper Static free bobbins Only pure type 'RMA' rosin is used meeting the requirements of MIL-F-14256F (ANSI/J-STD-0004) Manufactured under SPC guidelines Designed to leave a residue that is environmentally safe NSF - Nonfood Compounds Program Listed P1, NSF Registration #144207