Power Force Weighted Softballs | 3.25" Diameter - 15 oz | Weighted Training Softballs for Batting Practice | (6 Softballs) COLOR CORRECT Sports Researchers have determined that color is the most important element in repetitive memory development. Power Force Softballs are optic yellow, which increases the players memory response during actual game conditions. POWER HITTING Teaches Hitters to drive the bat barrel through the ball and finish strong. INSTANT FEEDBACK Player, Coach and Parent instantly know if there's good contact. HIT ANYWHERE Backyard, Practice or Tight Tournament warm-up area. MORE DURABLE Thicker Shell and Temp-Just Valve give Power Force balls added durability.