Tachikara SV5WSC Sensi Tec  Composite High Performance Volleyball SENSI TEC: Micro-fiber composites are bound together for a stronger, more comfortable and durable ball BUTYL BLADDER: Butyl bladders have the lowest amount of air permeability so your ball stays inflated for longer compared to more common latex bladders NFHS APPROVED: Approved by the National Federation of State High School Associations WEIGHT: Weighing between 9.1 - 9.8 oz./257.98 - 277.83 g Tachikara Composite High Performance Volleyballs are regulation size COLORS: Over 40 color combinations to chose from