OUR BALLS ARE 100% ORIGINAL, THE ONLY ONE DIRECT FROM THE GASER FACTORY MX PRO-GASER MODEL No. 5 Circumference 68-70 cm Official weight 410-450 gr Chamber (Bladder) Rubber Stringed Polyester Thread Intermediate casing Rubber Final Layer Synthetic Leather PVC Impacts at 50 km/hr 2000-2500 Meters per Thread 305 T. of Thread per model 915 meters Rebound 125-155 cm Pressure 7 lbs