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The Metal Earth models are amazingly detailed etched models that are fun and satisfying to assemble. Each model starts out as 4 inch square metal sheets and you simply pop out the pieces using wire cutters and follow the included directions to assemble your model. The CN Tower is a concrete communications and observation tower in downtown Toronto Canada and stands at 1,815 feet (553 m). When it was completed in 1976 it was the world s tallest free-standing structure. The CN Tower is a symbol of Canadian achievement and in 1995 it was declared one of the modern Seven Wonders of the World by the American Society of Civil Engineers. The model is 6.25x1x1 inches when built. Difficulty level: Moderate. No glue or solder needed.