If you play on a hard court surface, you need Extra Duty tennis balls. Due to the unforgiving nature of those courts you need a ball that will wear down less quickly. Extra duty balls have a thicker felt, that is woven not as tightly around the ball's core. This means the felt will perform better, for longer.

Developed for hard, abrasive court surfaces, Extra Duty tennis balls have a thicker felt woven a bit looser around the core to withstand shearing. That means that the felt on these balls are less likely to fluff up as they are played.

Generally, extra duty balls are more durable because of their thick felt. The extra felt will mean that the ball will last longer on these demanding surfaces. Extra duty balls will have a longer lifetime, but they will not play as fast as regular duty balls.

The difference is in the thickness of the felt ; Extra Duty balls have a thicker felt, while Regular Duty has thin felt, as both are adapted to their surface with specific factors, but above all they're made to level the speed of the ball based on the surface played so it's relatively standard when switching courts.

Are there different types of tennis balls for different court surfaces? Absolutely! While you may be used to standard pressurized tennis balls, other varieties include “extra duty” for hard courts, “regular duty” for clay courts, and “high-altitude” balls for playing at elevations of 4,000 feet or higher.

Down over time you can see that some of these get really kind of fuzzy. And hairy. And kind of poofy. And that's a pretty telltale sign that a ball has been played with quite a bit.

Extra duty is a punishment. These duties may be required to be performed at anytime and for any length of time. The duties may include performance of fatigue duty or any other duty.

Are there different types of tennis balls for different court surfaces? Absolutely! While you may be used to standard pressurized tennis balls, other varieties include “extra duty” for hard courts, “regular duty” for clay courts, and “high-altitude” balls for playing at elevations of 4,000 feet or higher.

Often made from macadam or concrete, hard courts are the most neutral of tennis courts. In terms of speed, it's faster than clay and slower than grass, but the bounce is a lot higher due to the harder surface.

I consider wool blend felt to be the best of both worlds - it's durable and strong like pure wool felt but it's affordably priced too! You can share all you want with your kids while using the same felt for heirlooms for your grandchildren.

100% pure merino wool makes high quality, soft felt with excellent integrity. It will not unravel, can be sewn close to the edge and will make you wonder why you ever settled for wool blended felt. Great for embroidery work, needlework projects, fine hand working, dolls and more.

Down over time you can see that some of these get really kind of fuzzy. And hairy. And kind of poofy. And that's a pretty telltale sign that a ball has been played with quite a bit.

There are four categories: Regular Duty or All-Court, Extra Duty or Hard-court, Grass Court, and Hi-Altitude. Regular duty balls: meant for soft clay courts, and indoor courts. They have a softer felt but do not last as long on hard courts. Extra duty tennis balls: meant for hard-courts.

noun. : a ball used in tennis that is made of rubber covered with felt and weighs about two ounces.

So instead at the end of the game I put my balls in pressure ball. It has an inflation valve at one end and easy to use clamp at the other. And it enables me to store my tennis balls at 14 psi.

Extra duties involve the performance of duties in addition to those normally assigned to the person undergoing the punishment. Extra duties may include fatigue duties. Military duties of any kind may be assigned as extra duty.