Bright yellow DUNLOP tennis balls for practice. - Brand: DUNLOP - Model: ST - Color: Yellow - Quantity: 50 - Usage: Tennis practice - Air pressure: 5/10 Thank you for viewing. All are used. They were used on an omni court for about 3 months. The condition is relatively clean, but the air pressure is around 4 or 5, with 10 being the pressure of a new ball. Since these are used, please understand that no claims or returns are accepted.