Head Tour XT Tennis Balls 3 pcs. Yellow 570823 Properties: Head pressurized tennis balls are perfect for tournament play on the court. Encore technology extends the life of the ball. The ITF certificate confirms the appropriate parameters of the balls, which are suitable for playing on hard courts and clay. The balls are characterized by very good feel and optimal control. 3 pieces per package.;Head Tour XT Tennis Balls 4 pcs. Yellow 570824 Properties: Head pressurized tennis balls are perfect for tournament play on the court. Encore technology extends the life of the ball. The ITF certificate confirms the appropriate parameters of the balls, which are suitable for playing on hard courts and clay. The balls are characterized by very good feel and optimal control. 4 pieces per package.