Tabriz is one of Iran's most significant cities and a historic center of carpet weaving. With approximately 1.5 million inhabitants and the status of the capital of the eastern Azerbaijan province, the city is known as one of Persia's largest and most important carpet-producing areas, producing both simple utility carpets and some of the most luxurious Persian qualities. The finest Tabriz carpets are typically divided into two categories: Tabriz Mahi, also known as the fish pattern, where the characteristic leaf-shaped Mahi pattern dominates, and Tabriz Nagsheh, which uses more figurative and classic Persian motifs inspired by Kashan and Isfahan, among others. The weavers in Tabriz are known for their high level of technique and often use a special knotting tool – a small hook – that provides faster and more precise knots. The pile material is usually fine wool, and in the most exclusive carpets, the details are complemented with silk, which gives an elegant play in the patterns. The colours of the best qualities are harmonious and refined, while the coarser weaves have stronger shades and are rarely exported. Tabriz carpets are often indicated by a quality number, e.g. Tabriz 50, which equates to approximately 500,000 knots per m², and the carpets are generally considered very durable, technically superior and a safe choice for collectors and those who want a high-quality classic Persian carpet.