Used Head Gravity Pro V2 315g, 18x20 string pattern strung with Head Lynx Tour 1.25. Good condition.
Actual measured (strung) specs are:
Weight: 343 gBalance: 320 mmSwing weight: 340 kg cm2Twist weight: 14.4 kg cm2
Cut and paste from Tennis Warehouse below:

Technical SpecificationsLength 27 in 69 cmHead Size 100 sq in 645 sq cmWeight 11.7 oz 332 gm Balance Point 12.75 in 32 cm 6pts Head LightConstruction 20mm / 20mm / 20mmComposition Graphene 360+/GraphiteString Pattern 18 Mains / 20 Crosses
Babolat RDC Ratings Score GradeFlex Rating 63 Range: 0-100Swing Weight 334 Range: 200-400