This special rosin core solder is ideal for surface mount devices. The high activity flux creates more reliable soldering and leaves bright shiny solder joints after reflow. Equivalent Part Numbers: 6400035 | 640-0035 | 64-035 2% silver-bearing formula (Sn 62%, PB 36%, Ag2%). Rosin activated flux for stronger joints. 0.015 diameter. 1.0 oz spool. RadioShack Catalog №: 6400035 (64-035) ASIN B07NK59QRY Model 6400035 Brand Name RadioShack Item Weight 1 Ounces Part Number 6400035 Bearing Type Ball Bearing Manufacturer RadioShack Material Type silver Item Thickness 0.02 Inches Outside Diameter 0.02 Inches Specification Met Oem Compatible Lubricant Grease