The Metal models are amazingly detailed etched models that are fun and satisfying to assemble. Each model starts out as metal sheets and you simply pop out the pieces using wire cutters and follow the included directions to assemble your model. No glue or solder needed. If you need tools, you can buy here: https://www.amazon.it/dp/B06Y2FY287 London Bridge refers to several bridges that have spanned the River Thames between the City of London and Southwark, in central London. The current crossing, which opened to traffic in 1973, is a box girder bridge constructed from concrete and steel. It replaced a 19th-century stone-arched bridge, which in turn superseded a 600-year-old medieval structure. This was preceded by a succession of timber bridges; the first was built by the Roman founders of London. Item#:MMS022; Number of sheets:2 Sheets; Difficulty:Moderate; Assembled Size: 5.46″ x 0.78″ x 2.22″ (14 x 2 x 5.7 cm). The Brandenburg Gat. The Brandenburg Gate is the only remaining gate through which Berlin was once entered. It was commissioned by King William II of Prussia as a sign of peace. The design is based upon the gateway to the Acropolis in Athens. Atop the gate is the Quadriga, a chariot drawn by four horses driven by Victoria, the Roman goddess of victory. Item#:MMS025; Number of sheets:2 Sheets; Difficulty:Moderate; Assembled Size: 2.38″ x 2.34″ x 1.17″ (6.1 x 6 x 3 cm).