Old tennis balls are perhaps the most versatile of all used sporting equipment. 

Squeaky chairs on a classroom floor? Tennis balls can fix that. Own a dog? Tennis balls are the quintessential fetch toy. Want softer clothes? Throw a few tennis balls into the dryer and you have some affordable and reusable fabric softener. These are just a few of the most popular uses for balls that have lost their pop.

But what about a portable bluetooth speaker?

That’s just what British speaker company hear0 has done. In an effort to reimagine the use of leftover tennis balls, hear0 has partnered with manufacturers and engineers to design a portable wireless speaker. 

But these aren’t just any old balls. For their speakers, hear0 is using balls that were actually used in Grand Slam competition. Not only are they a small piece of tennis history, but in many cases, the balls have been signed by some of the game’s best players, including Simona Halep, Gael Monfils, Marin Cilic, Grigor Dimitrov, and former Wimbledon champion Pat Cash. 

In addition to the autographed editions, their most noble speaker, the her0 for Heroes will donate a portion of the proceeds to Doctors Without Borders. 

The non-profit is working tirelessly to help save lives during the on-going pandemic in more than 70 countries. For every white ball sold, hear0 is donating $10 to the responsive organization as they continue to fight the virus.