The O3 White was new for 2007-2008 and has a few nice features. It combines O3 technology, the new O3 Plugs to let you control your weight, and the DPR Lite style string pattern to make one of the more powerful racquets Ektelon has ever produced. Ektelon also eliminated 2 main strings from last year's models to increase overall power. This racquet is designed for the slightly younger player having a base weight of 170. The nice thing is if you don't know if you need a 170 or 180 or wish you could go up a few grams when your arm gets tired, pop the plugs in and it's a go!!