Yonex Nanospeed Iron Set 4-SW (R) MSRP: $890.00 Yonex Cyberstar Nanospeed i irons. As used by Colin Montgomery. The Cyberstar Nanospeed multi-material irons are equipped with Elastomer, a rubber-like material, which is sandwiched between two graphite plates behind an ultra-thin stainless steel face. The combination of graphite and Elastomer increases the repulsion power ("spring like face") at impact without sacrificing feel and workability. The graphite and Elastomer head construction dampens any unwanted shock for enhanced feel. The short irons (PW, SW) feature a half-cavity blade like head for softer-landing approach shots with unmatched spin performance, forged iron type balance and feel for "pin-point" accuracy. Regular Flex - Graphite Shaft - 4, 5, 6, 7, 8, 9, PW, SW = 8pcs