The Callaway Tour i(z) golf ball features the following: Through second generation Dual Core technology, Callaway engineers have designed a 4-piece Tour ball that delivers even faster ball speeds. The refined HEX Aerodynamics pattern has been improved to reduce drag and improve flight stability through every kind of wind condition.
pdiddy1980 - 1/18/12 I don't notice any significant differences between these and Pro V1x balls. Other than the cover being slightly more durable both perform great. I usually stock up when Callaway runs their 2 dozen for $60 special