The Ektelon O3 Black 175 Racquet is manufactured using Ektelon's advanced graphite resin bonding process, making this great playing frame as durable and impact resistant as possible while still incorporating their O3 technology. By integrating huge O-Ports it creates a larger sweetspot, a livelier response, and increased power thanks to increased string movement around the edges of the frame. O-Ports also make the frame more aerodynamic, reducing drag, and allowing for a faster swing speed.