The O3 White is one of Ektelon’s best selling frames they ever produced with added ESP technology and Carbon Kevlar technology. This Racquet Features: Extreme String Pattern (ESP) - Unique string bed designs push the envelope on string pattern technology. 170g and 3800 power level.The O3 Red is another powerful racquet. 170g and 2700 power level. I am selling both together. I am no longer able to play. They are great racquets and I am sure that you will like them. These are not cheap beginners racquets.