higher quality group of basketballs balls are glued with a synthetic surface layer material, based on polyurethane balls are flexible and pleasant to the touch the bladder is butyl-based rubber, is fitted with winding fibers between the bladder and the surface layer material is a rubber layer FIBA approved, the ball meets all official technical parameters bonded ball size 7 (BB 7011 C), 6 (BB 6011 C), 5 (BB 5011 C) ball designed for top competition, recommended for the game in the lobby surface material is synthetic leather FIBA (International Basketball Federation) official technical parameters Weight (g) 560 - 650 Circumference (mm) 750 - 780 Rebound height (mm) 1.200 - 1.400 Pressure (kPa) 50 - 65