WALNUT HOLLOW-Lead-Free Solder. Join metal together using Walnut Hollows lead-free solder. The solder contains 99.25% tin/0.75% copper with rosin core. No additional flux required. Use the Lead-Free Solder with Walnut Hollow's Creative Versa-Tool (not included). This package contains 0.3oz/8.5g. Imported. 1 Pack of 1 Piece