Used hard tennis balls, 80 balls

Used Hard Tennis Balls
Dunlop HD: 68 balls
Dunlop FORT: 8 balls
Prince: 4 balls

Opened sequentially for weekend practice sessions.
Used for singles match practice (at a rate of 4 balls per 2 hours).
Surface: Omni court.
Stored at home in a case after use.

*Latest opening date: March 22nd
36 HD balls were opened from January of this year onwards and still retain good air pressure.
12 HD balls were opened in December of last year and have slightly lost some air pressure.
20 HD balls, FORT, and Prince balls were opened in November of last year and have lost air pressure.

How about using them for ball feeding, serve practice, children's practice, for rainy days, or even for batting practice? (^^)/

Type: Pressurized balls
Use: Hard court