Lacrosse Ball Resurfacing invalidates the NOCSAE certification standard which allows the lacrosse ball to be SEI certified for game play.  When used lacrosse balls are resurfaced, they have been altered to a different condition than when initially tested and certified.  Such changes to a ball through resurfacing can reduce a ball’s weight and circumference and pose serious risks to players’ safety. See NOCSAE’s statement on their site here.  Read more about this issue on our blog here.