Shimano Stradic Carbon Iodine + 2500 Ra 16 Drag the new Stradic Carbon Tetraiodine + FA, the latest lightweight carbon tetra-iodine body and Buenos Aireless lightweight spool each set for superior overall weight reduction making it perfect for this new model lightweight rod. The ultra-lightweight Magnumlite carbon tetra + rotor delivers a smooth overall super rotation. 2. Gears and 5 ball bearings (x-ship and Shimano roller bearings, Stradic Carbon Tetraiodine + RA generated cranking provide even the most demanding conditions to smoothly handle the most demanding conditions. Available in two sizes, 2500 and 4000. This carbon tetranodide +: Carbon tetryoxide + is an advanced version of the original carbon tatryoxide. This technologically advanced material can be used on many high-end Shimano reels with 2.5 times more rigidity than carbon tetraiodine and reduced weight. The body and rotor use carbon tetranodizing + has superior strength and efficiency