REUSCH 1475502 APEX SOCCER BALL Separate panel weighing for each panel to insure balanced weight distribution. This assures a perfectly balanced ball and truer flight stability. Double knot hand stitching. No machine stitching is used. This creates long lasting, deeper more consistent stitched seams, which afford a truer flying ball. Pre-stretched polyester threads insure that once stitched, the panels will not separate from inflation pressures, assuring a round ball that stays in shape. High-pressure plating insures consistency of casing materials. This improves both longevity of the ball and flight performance. Secondary Quality Control- A second check on every ball that includes inflation, stitch check, print check, valve check and roundness check after 24 hours wait time.