The price of aluminium rods is primarily determined by the alloy grade (e.g., 1000, 2000, 6000, or 7000 series). 6061 and 6063 alloys are the most common for structural and architectural use due to their excellent extrudability. Additionally, the temper designation (such as T4, T5, or T6) affects the mechanical strength and processing cost. Buyers should also specify the diameter tolerance (typically +/- 0.02mm for high-precision needs) and surface finish (mill finish, anodized, or polished), as these factors directly impact the final quotation.