MIKASA Portball Game Ball and Elementary School Meets Ministry of Science and Technology Recommended Internal Pressure (Boys', Girls', Students) -

Port balls that meet the Ministry of Education, Culture, Sports, Science and Technology standards (For boys/girls/elementary school) Color: Yellow Material: Rubber Diameter: Approx. 21cm Circumference: 65-67cm Weight: 370-390g Recommended internal pressure: 0.45kgf/square centimeter Please note that this product will be delivered uninflated. By using Mikasa's unique specially compounded rubber material, we have achieved the optimal rebound for port balls!