Chem-wik L4 1.5 mm x 15 m is a non-activated, white rosin flux (in accordance with MIL-F-14256F, Type R) that is laminated onto the entire braid to protect it from oxidation and enhance solderability. Ultra-pure, oxygen-free copper braid quickly and completely removes solder from circuit boards and components. Its rapid moisture transport protects components from harmful heat. Number of products in the box: 1 piece.