CX-1 was also sourced in Taiwan. The top-of-the-line Colnago frame, the C64, as well as the Master, and the now discontinued C60, C59, C50, Extreme Power, Extreme C are (or were) manufactured and painted in Italy. In a series of public statements, Colnago has insisted that all designs originate with the Italian design team, claiming that the essence of what makes a Colnago is design. The mid-range carbon offerings are currently being sourced from Taiwan, (as are many bicycle manufacturers' offerings), and as of 2011, the M10 (which stands second in the model lineup) is made in Taiwan and assembled and painted in Italy, while the CX-1 is completely made in Taiwan. The current top-of-the-line frame, the C64 is the only carbon frame still made fully in Italy. Frames Steel Super Version 1 (1968-1978)--Columbus SL tubing, circular tubing (top tube, downtube, seattube) crimped chainstays, cable routing above bottom bracket. Mexico (1975-1977)--Columbus Record tubing, no crimping on chainstays and variant Esa Mexico Super Profil (1982-83/84) two versions--with fluted stamp stay cap, 1984 with flat stamp stay cap. Super Version 2 (1978-late 1980's)--Columbus SL tubing, curcular tubing (top tube, downtube, seattube) colnago lettering embossed on the seat stay caps, machined chainstay bridge. Nuevo Mexico , two models, (1983 version and 1985), Columbus Record tubing, crimped top tube and downtube. Tecnos (1995–2000)--Colnago's lightest production steel racing frame made with custom Tecnos tubeset (proprietary Columbus Nivachrom steel), oversize top and down tubes with five-rib-clover shaping. Chromed three point crown-tip lugs on head tube and Precisa steel fork (when not shipped with a carbon fork). Last iteration was labeled 'Tecnos 2000' including the tubing label. Master (1983-Present)--Top of the line steel frame with Precisa steel fork. Columbus Gilco fluted tubes on main triangle. There are a number of known variations. Master Olympic, Master Light, Master Più. Other steel models include the Superissimo, the Super Più, the Export (1982-3), the C-94 (1994), the C-97 (Thron tubing Decor era), the Elegant (Tange in 1994, later EL-OS tubing) and the Classic (~2000); a descendant of the Super/Superissimo made with Zona tubing. Aluminum Duall—(1988) Double downtube aluminum tubes bonded to aluminum lugs manufactured by Alan for Colnago, lug design from the single downtube version. MegaMaster—welded Columbus Altec aluminium alloy profiled tubes with mega downtube and a "master" profile top tube. Asso—(2000s) Altec Zonal triple butted tubing; master profile top tube. VIP 2000—Altec Zonal Columbus 7005 Dream—(2000s) Welded Columbus Airplane