About the BallsThe best-selling tennis ball in America, Penn is the standard by which all others are measured. An ideal tennis ball for those looking for a casual practice session, Penn Pressureless Tennis Balls are great for players looking to fine tune their game. Long-life pressureless cores offer extended play value with Penn quality you know you can trust.• Mesh bag with drawstring allows for easy transport and storage.• A perfect ball for practice machines.PennPenn celebrated 100 Years of Excellence in 2010. Starting in a small town in Jeanette, Pennsylvania in 1910, Penn is still America’s #1 One Selling Tennis Ball. Also, a purveyor of everything tennis, we put our 100+ years of expertise into all our tennis equipment & apparel so you can perform at the highest level every time you step on the court.