Wilson A1010 High School Baseballs...Take Control With SST! A patented design and manufacturing process allows Wilson to make Super Seam Technology (SST) seams 20% higher than traditional raised seam balls. SST seams give pitchers and fielders maximum amount of control while remaining durable due to the incorporation of leather material under the stitches. Wilson A1010 High School Baseballs feature: Approved for High School Play Red cushioned cork center w/Dura-Core Technology Core is pressure formed to withstand impact Baseball retains original hardness 20% better Grade A full grain leather cover Super Seam Technology (high raised seams) Gray wool windings Available in Dozen quantities Top Quality High School Baseballs!