【12-Pack Set】Official Regulation Size 5 of composite leather volleyballs with long-lasting quality and soft touch; premium Pump with Needle 【Long-Lasting Air Retention】High-quality inner butyl rubber bladder Maintains Maximum Air Retention, hold the air for long time; the ball is shipped deflated, stretch the ball first before inflating to avoid inner bladder damage 【Great Softness】 great softness for setting, serving, hitting drills and passing, ergonomic design will not cause too much burden or sting on the elbows and arms 【Sturdy Construction】exquisite stitching and tight seam ensuring sturdy construction of inner part and outer skin; the ball can be cleaned easily or used in water because of its excellent air tightness