Indoor practice: Tosses while lying on your back Outdoor use (molten): For passing and serving practice on the grass, etc. Used only a few times. (The outdoor ball has some dirt from outdoor use) Purchased to practice at home. I've transferred schools, so hopefully someone can use them! When sending: I plan to deflate them for shipping. Size 4 volleyball, air pressure 0.29-0.32 bar, made in China - Brand: sa.gear - Brand: molten - Size: 4 - Made in: Vietnam - Air pressure: 0.29-0.32 bar Thank you for looking.