By combining the precision and durability of RPM Power with the plush and powerful response of Xcel, Babolat has created a hybrid with phenomenal all-around playability. In addition to being a great option for the polyester user who wants extra comfort and power, this hybrid is also ideal for the player who wants to transition into the world of polyester. Players looking for more control and spin should put RPM Power in the mains. Players looking to emphasize comfort and power should try Xcel in the mains. 
Gauge
RPM Power:  17/1.25mm 
Xcel: 16/1.30mm
Length: 40ft/12m (total)
Composition: 
RPM Power:  Co-polyester Monofilament 
Xcel: Multifilament
Color:
RPM Power:  Brown 
Xcel: Natural