Based on this product's specifications, here are some alternatives and similar models
Soldering Tin Rod Topex 60% Sn 7x7x250 mm (44E519)
Summary description:
Topex soldering tin rod with 60% tin content, dimensions 7 x 7 x 250 mm (MPN 44E519). Solid soldering core for manual soldering and repair work, suitable for general electronics and metal joining where a 60% Sn alloy is required. Offers a consistent composition and cylindrical form factor for use with soldering irons or torches.